A billy is synonymous with a very close friend or buddy. Usually billies hang out and partake in the injestion of cannabis and/or alcohol.
"Lets have a fuckin' billy night, with the billies"!
"What did you do last night "?
"I was with the billies. We did billy things".
"What?
"Not sure".
"What did you do last night "?
"I was with the billies. We did billy things".
"What?
"Not sure".
by Therealbilly August 18, 2017