Something you like to swim in. As coined by the excellent Benny Lava...
Beejay: "I like to swim in his beeeeeejaaayyy!"
by WhatBodyLoves August 08, 2008
When a girl sucks your dick...
My girl gave me a Beejay last night. It was real cool.
by Cap'n David William Crunch April 13, 2009
Also, for slopokes, it is BJ
My girlfriend gave me a beejay last night
by Dormidont March 27, 2009