They're not lost in the sense there's no records, lost in the sense I don't know the names and haven't been able to find them in all my searches!

1. "Everybody is somebodies lunch!"

This daycare place I was often at as a kid had a TV with a VCR (this was around 2008/9, so DVD players were well adopted by this point, but they hadn't upgraded) and a collection of VHS's to go along with it (think veggie tales, peanuts, and miscellaneous educational things). I was doing something else, but someone had put in a tape. My mom arrives to pick me up, and from the TV blares "😃 💗 🎵 EVERYBODY IS SOMEBODIES LUNCH 🎵 💗 😃" as lyrics in an overly cheerful song about the food chain.

My mom and I found the tonal dissonance hilarious, and we still joke about it to this day, we use a specific melody to go along with it and everything (has to be remembered from the original), there's apparently a book called everybody is somebody's lunch, but that's not what I'm remembering.

Needless to say, since both my mom and I saw it, I'm 100% confident this actually exists out there in the world somewhere. I'm assuming it's been hard for me to find since y'know... it's probably some niche educational VHS.

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2. Grossout nicktoons (?) short (?)

Gross warning for this one lmao, you I guess can take comfort in knowing I'm being honest, because I'd never make this up

Some sort of pilot, or animated short? heck it could even be a commercial. that I believe aired on the Nicktoons channel (would've been around 2006-2010), but technically could've been somewhere else (nickelodeon [i.e. the main channel], or cartoon network).

It was about two nose goo monsters that were sad because they were in different nostrils. Animated, very de-saturated colors. I wanna say it had like... way more moving music than you'd expect given the premise.

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3. Random episode of Ed Edd n Eddy I can't find

This one's funny because I obviously know what show it's from, I just have not been able to figure out what episode it is based on reading episode synopses, I've looked many times over many years, still can't find it. i've always figured if i get desperate enough, i could just watch the whole show in search of it, but i have yet to get around to that.

details i'm most confident about: It was about two characters competing in progressively more dangerous challenges. other characters try to dissuade them from competing, but they're too lost in the sauce. the final challenge results in both the competitor characters in full body casts, even then still being competitive.

details i'm less confident in: in my memories the characters competing were eddy, and sarah. but again... i'm less confident in this. could've been any of the kids in the show.
the other possibility of course is that it's an episode from another show, that i misremembered as an ed edd n eddy episode. but uh. it'd be weird if that were the case. i didn't like the episode (the idea of being consumed by something that was self destructive unnerved me), and it made me stop watching the show for awhile because of it LMAO so it'd be weird if i "convicted the wrong guy" as it were. but it's a possibility.

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4. Movie with robot woman

This one is... both very vague/broad/lacking detail, and also could've been something my brain has embellished since it happened so long ago.

This one would be older, I saw it somewhere around 2001-2004, but it could've been from the 80s or 90s. Basically I have a memory of being a very small kid, watching TV with an older cousin, he was flipping through channels and stopped on something with a robot woman. when i encountered Hajime Sorayama's work in my late teens was taken aback because she looked exactly like that, chrome and pointy, sharp edges.... but yeah i told my cousin to change the channel because she scared me. she was a character that recurred in my nightmares for a while after that lol.
Anyways though, it was live action (not animated or CG), and presumably wasn't aimed at a family/kid audience. I vaguely think she was like, fighting someone? But for all I know she could've just been standing menacingly and that was enough for me.