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1.
n. one who fucks tits; more specifically a man who inserts his penis between (typically) a woman's breasts and humps away
My friend Joe is one nasty tittyfucker; he had her on her back and he spewed on her face.
by mackdaddy November 23, 2004
 
2.
When you fuck their titties
I titiedfucked my hot girlfrined
by Brandon da tittyfucker May 13, 2003