Pushing your testicles between the legs, over the taint, then squeezing the legs together to hold, expose and display a taut ball sack at the base of the ass crack.
A skilled moon baller can walk around in this position displaying his wares for those that dare to catch a glimpse.
Everything was great at the family dinner until uncle Fred came out of the bathroom doing the ol’ moon ballin’.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.