look up any word, like muddin:
 
1.
your worst nightmare. karlen is a person filled with revenge and would go to the end of the world to have things his way.
a mobster pulled a karlen on that guys life.
by ak717 March 31, 2011
 
2.
A loser who twirls his pens DAMMIT way too much and later gets them jacked by a teacher and cracked in half. How freakin sad.

But, in his defense, he has sweet glasses.
Dude, your such a Karlen
by MrMcGoogles August 16, 2009