Just before ejaculation, the man brings his legs up and locks the woman's head down on the penis.
At the exact moment of ejaculation the man farts, causing a faceful of fart and semen for said woman
The Viking Longboat is best performed after Mexican or Indian food for the perfect finish
Dude 2: ''DUDE! Did the fart stink?''
Dude 1: ''Hell yeah it did! I ate like twelve burritos the night before!''
Dude 2: ''DUDE!''