two men admiring a hot female put one arm around each other, cross arms at the front and proceed to whack eachother off. NOTE: if a group of mates get the same desire, they line up side by side and perform a river whack.
Paul and Steve were at the pub, when in walked an amazing blonde. The boys pulled eachother close and in unison screamed "BUDDY WHACK!!!!" This unusual practice brough a few stares from the older crowd at the rsl.