Butt Chilling
Working up an erection, sticking it in a dudes ass and chilling, preferably while watching a movie. This act is not gay, as thrusting is strictly forbidden. Rule of thumb: Pumping=gay, Chilling=cool
Nothing beats driving down a bumpy road while butt chilling so you can sneak in a few no homo thrusts.
butt chills
Prickly goose bumps in the general rectal area after getting a fecal transplant through an ng tube
This CDiff is killing me but the butt chills feel great.
chill butts
The act of two or more people spending time together, aka "hanging out"
"Hey wanna chill butts tonight?" "Yea that sounds good, what you wanna do?"