yerp-a-derp 

another way to say yes, or agreeing to something.

Adam- "Did you round that bases with that chick last night?!"
Ryan- "YERP-A-DERP!"

yerp-a-derp by A.B.S15 May 8, 2008

yerpaderp 

its a form of saying "whats up?" or agreeing to something.

adam: yo Ant, you going to the party?
Anthony: Yerpaderp.

yerpaderp by RAndomking14 May 5, 2011