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1.
the sound you make when a chickenhead is present
When Julie came out after sucking 5 consecutive dicks in the shag room, Sam instantly started making pecking motions and yelling, "Cluck cluck! Cluck cluck!"
by Nick D February 21, 2003
 
2.
A shortened version of the response to "Quack quack seat back", usually when small children are around. Full phrase is "Cluck cluck, i dont give a fuck"
Person 1: I gotta go to the bathroom, quack quack seat back

Person 2: *takes seat* CLUCK CLUCK
by kllax22 January 11, 2011