"hello? yo, you there...? aw man. I think i just got buttdialed."
one minute later...
"hey. ... hey wait a sec. Again!?"
1. To phone a friend accidentally using ones buttocks. Usually this is a result of sitting on the phone.
Person 1: hello?
Persons 2, 3, 4, and 86: unintelligible drunken noise
Person 1: Is my reception bad?
Person 86: Shit, it's person 1. You just buttdialed him. Now he knows everything!
Person 1: WHAT?! HELLO?!