The unknown and rather disturbing substance that accumulates under your nails following scratching an itchy ass; a less dense form of ass cheese.
Also, a reference to something nasty;
"DUDE! Quit digging in your ass! Now you have rectal butter under your nails!"
"That chick needs to take a damn shower! She smells like rectal butter!"
The gross residue in-between your keyboard and mouse from intensely sweaty gaming.
Gamer: Ew, my desktop is covered in gamer butter. There's so much of it you could spread it on toast.
Semen that tastes like whiskey the morning after a long night of drinking a lot of whiskey.
After a long night of drinking Angels Envy, I gave my boyfriend a blow job only to find out his semen turned into whiskey butter.
When your balls get sweating and stick to your legs
After a long day of working out I noticed I had a bad case of turtle butter.
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I was about to go down on this lady, right, but she hadn't washed herself in a couple of days and she had bison butter all over her junk.
A beautiful woman from head to ankle because below that is either talons or a baby head big toe .
That chick is banging, everything butter toes that is
When you eat spicy Mexican finger food like tacos, and then finger your girl to completion. The resulting aftermath is Mexican Butter.
When we got home from Taco Bell, I was flipping her bean and she covered my hand in Mexican Butter.