Two people who just happen to have buttsex with one an another.
"Please be my buttbuddy?"
by Samm-ay January 10, 2007
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Someone who you are friends just to fuck.
Neighbor: I heard you guys fucking all night.
You: Yeah, that was me and my buttbuddy.
Neighbor: That? Score!
by MTWEmperor February 15, 2010
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a male and a female who do butt stuff and have a sexual relationship as close friends
sara and jacob are buttbuddys they always are sending eachother pics and having sex
by jacobyluis March 12, 2019
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