2. A cute, common insult used jokingly towards friends or someone you like. It's better than using something inappropriate where people might ACTUALLY get offended.
"You texted me in the middle of English! Buttholesurfer, my teacher got mad at me.."
A game in which two people frivolously run around with no pants and attempt to stick a finger in the opposing player's asshole. The loser, undoubtedly, has a finger in their butthole.
I played a game of buttholes with Suzie last night. I lost... First time I've ever had a finger in my ass.