Definitions by Dinotastic

square butthole 

When someone gets fisted so much their butthole turns into a square shape.

Becky: OMG! Did you hear about Johnny?
Stacey: No, what happened?
Becky: He got pounded so hard last night he now has square butthole.

Stacey: Wow.

square butthole by Dinotastic March 12, 2017