Learned this from some South African guys. Try to picture this: Two men pull down their pants, and bend over, backing up so their butts are touching firmly. A third person puts their head on the floor (or bar) directly beneath their junk. A fourth person pours a beer through the gap created by the first two's buttcracks, this then pours into the third person's mouth.
It was so gross, those dudes over there were so twisted they did a greek funnel up on the bar last night!
by Fritz Roeth April 1, 2010