Inserting foreign substances inside your rectum for the purpose of absorbing the active ingredients into ones body. using vasoline or another lubricant to coat the outer edge of the rectum in an attempt to soothe the experience is common.
"dude, where are those rolls?" "ahh man, i justbooty bumped 'em, why, did you want some?"
When a female snorts a line of cocaine off of her male sex partner’s erect penis, and then he immediately bends her over to snort a line of cocaine off of her buttocks.