Butt Spittle 

The liquid that comes out of your ass when you dry-ish fart. Like ass saliva or buttcrack sweat.

When you take a slo-mo video of you farting, don't get any butt spittle on my phone!

Butt Spittle by Jean Jumps June 22, 2016

Butt skittle

this is when you are sitting on an airplain for a long time and in the air port you find that long lost skittle that fell during snack time

shit man, you have a butt skittle

Butt skittle by kyle wesockes September 28, 2004