When your balls dunk into the toilet when you sit down to take a crap.

When you eat dirt for the first time and leave your family to build a shack in the woods

a persons booty or ass; a dunka dunk dunk in the trunk

a game played by a group of adolescent males. The game consists of one male at a time firmly grabbing another's package so that the pain is not excruciating just very uncomfortable for a few seconds. Hits, kicks, slaps and projectiles are often used in the game but then it becomes Dodge-ball, anything that provokes testicular/ penal pain is allowed. The only rule is to say Dunkers before grabbing someones junk and to accept that once you have, they will most likely get you back at some stage soon.

Condom, as in what you dunk your nob with

A girl who dunks her biscuit into every man she sees.