Noun
The toilet paper residue left on your cheeks after you wipe.
“Kari was unaware of her buttfetti which would go on to ruin her Netflix and chill tinder date. Just another example of the dangers of one-ply toilet paper.”
Friend: Hey what did you do last night?
RODKING: i had the most amazing buttcest ever with my brother!!!
Friend: Dude, my bro and i have buttcest all the time