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1.
The act of hitting your hand over and over in a conversation.
Your left hand is flat while your right hand is straight up, like a karate chop kinda thing.
Your hands should look like an upside down T if done correctly.
Mainly used when you want to get someones attention during a converstation, or just a habit.
I just pulled a crumpton.
by pr3ttyb0y!?! March 10, 2010
 
2.
to have an extremely large penis
"That boy has a large crumpton would'nt you say?"
by Crumptz June 16, 2005