A saying used by flava flav, another fucked up and washed out rapper that thinks saying... YEAH BOYIEEEEE at the end of every sentence will make their fifteen minutes of fame even longer.
When two or more men get together to enjoy a cordial time together. Or when a girl that is basically a dude, hangs out with a dude that has no mutual sexual interest.
"Hey man if you wanna come to the bar, craig and i are Boyin' up hard as hell right now."