What is Buttring?
1.
the anal sphincter
See also
Angie shouted when Pete's gigantic dick forced her buttring.
2.
The sound it makes when a guy fucks a girl up the hiney, slips a cell phone in there, and then has somebody call it. The buttfucked girl is usually confused about what is going on.
Soon after Mindy staggered out of the frat house bathroom, we heard the buttring. We knew that she'd given up her pooper even before she could tell that the sound was coming from inside her guts.
See