random hookup 

being drunk and making out with someone, whether you know them or not

i just had a random hookup with (insert name here)

random hookup by lsy28 October 20, 2010

random hook-up buddies

Much like a friend with benefits, a random hook-up buddy is someone you're not actually in a relationship with but still get busy with.

Unlike a friend with benefits however, random hook-up buddies hook up on less frequent, more random (hence the name) intervals.

"Mark and Brooke must be random hook-up buddies. The two or three times a month they see each other they always get busy."

random hook-up buddies by JVL August 2, 2007