look up any word, like darude - sandstorm:
 
1.
1. Slightly confusing personality.
2. Introvert person with homicidal tendencies.
1.
"Oh dear, look at his face! What happened to him?"
"He most likely met his Maartje!"

2. "Run! There's a Maartje heading our way!"
by Scott Tribbleswatter June 15, 2007