To be utterly and totally owned by someone who is obscenely massive and uncoordinated looking. Comes from the German NBA player and current NBA champion as of 2011 Dirk Nowitzki.

The act of physically or metaphorically pre-maturely orgasming on a person or situation. To make a huge mistake.

The feeling of excitement you have when the Dallas Mavericks win.

To dirk someone, or multiple people. A sort of mildly-threatening dance involving a rigid front leg, and generally a textbook get-em-up. Dirks take many forms, and are indeed unique to the individual.

A well put together guy, who can protect and look after people he cares about. Dirks can be immature sometimes, but know how to crack a joke at the best time. They’ll make jokes when you’re upset to cheer you up, and when they’re trying to help you feel better they’ll succeed. He looks after people he cared about, and trusts a certain few with his secrets. Dirks are the most upbeat you’ll ever see, unless they’re tired. If you befriend a Dirk, you’re the luckiest person alive.

More than a jerk less that a dick

To Dirk is to leave a place or event uncerimoniously, usually before one should leave, just like Dirk Nowitzki left to the locker room before the end of Game 6.