By A Mystery Man Writer
Here's what happened when 12 random people took turns drawing and describing, starting with the prompt "Underpants Sans (Google it)".
Pixilart - UNDERPANTS SANS *with eye by MrLFG
Underpants Sans Sprite by Addicted2Electronics on DeviantArt
Underpants Sans (Reupload) by Cezar Andrade - Game Jolt
Pixilart - Underpants Sans expressio by DD-sans
Pixilart - UnderPants Sans by ManWhoIsNotSus
LEGO Multiverse, Video Games Fanon Wiki
Underpants/Derpy Sans (Inspired by Sir Pelo) by CoffinCrisp1 on DeviantArt
SANS FROM UNDERPANTS (undertale parody) - Drawception
Underpants SANESSS pranks on Undertale Sans in Apr by Abbysek on DeviantArt
SANS UNDERPANTS Meme Generator - Imgflip
sans - Drawception