Youtube-Poops were a once common internet funny video genre, often accompanied by stop motion visuals via Gmod, that hinged on cutting together sounds to make characters say words (there’s more to it but that’s the gist)

Assets are the stuff you see in a game. Like the citadel or the g-man or whatever

SFM is source film maker, a tool where you can use all kinds of assets (but it basically comes with the Valve stuff) to animate all sorts of stuff.

Skibidi Toilet is I the Gen Alpha thing, where SFM and HL2 assets are used to tell some kind of story about some dystopian future where the skibidi toilets rule, or something? It’s a whole thing. Think like Slenderman, or Ben drowned if you’re that old, just as videos.

Skibidi itself is a song by russian band little big that gets remixed for these videos, allthough I could not tell you for the life of me how all of it found its way together. There’s also the camera men on the good side (I believe) that do seem to take inspiration from siren head