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(noun) A ‘man about the house’ who is a non-blood relative and enjoys cohabitation and sordid romps with one’s natural mother. In modern parlance - your mom’s live-in boyfriend or lover.
Teacher: Scooter, will I be seeing your mom and pop at the Parents Evening tonight?
Scooter: Mom’ll be there – she’s bringing my Sex-Dad.
by Tremendous Embakwame July 10, 2008