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A hammer knocker is a kind sir. Its meaning was derived by a 40 yr old man who still lives with his mom and is a very good friend of shane.
Jordan: man that kid is acting very polite today
Shane: Yea hes a hammer knocker
by Jordan1 July 27, 2007
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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