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1.
1. adj. can be used to describe anything amazing or ridiculous or redonk that happens especially in relation to basketball

2.adj. to describe when an NBA player makes an amazing pass for an assist

3. adj. to describe when a player makes a deceptive play at the hoop put a lay up in

4.adj. can be used to describe when a player gets a triple double

5. adj. most importantly used to describe Rajon Rondo and his play
Man that guy couldn't miss a shot tonight, that was rondonkulous

Rajon Rondo is rondonkulous out there tonight helping the Celtics.

Did you see that rondonkulous no look pass.

Did you see his stat line tonight it was a rondokulous, another triple double.
by DWeber May 08, 2009
 
2.
means ridiculous ... used up North
"I ate 2 whole pizzas for dinner"
"That's rondonkulous!"
by Taylor Statten Camps November 07, 2005