Thread: A real knee slapper
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  #37  
Old 06-28-2012, 07:48 PM
Kimm Barely Kimm Barely is offline
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Old man Nirgon confirmed old man:

knee-slap·per [nee-slap-er]
A noun - Informal.
a joke evoking boisterous hilarity.

Origin:
1965–70, Americanism