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1.
Having a lousy sex partner, usually associated with breaking up.
My ex was a mulletfuk.
by DBHx August 22, 2006
 
2.
Lousy sex with your spouse, ex-girlfriend/boyfriend or cousin.
I wish my brother had told me cousin sally was a mulletfuk, I would have stayed home and whacked off.
by DBHaddix August 22, 2006