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When dancing at the club: This is when a woman faces away from you, bends over, and uses you like a stripper pole. This usually includes booty to package contact, with rhythmic grinding, followed with a quick squat performed by the woman to where dat ass either hits the dance floor, or your shoe.

When having sexuals: This is when, while in the doggy style position or one of its variants, the woman either pushes back upon the male member and then grinds on the cock while it is fully inside of her, or when the woman gyrates her hips vertically while stroking back and forth on the cock.
lil Wayne in the song, 'Every Girl': "...I just wanna get behind it, and watch you back it up and dump it..."

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Bob: What did you do this weekend?

John: Well, Friday, yo mama called me when you went to sleep, and I came over and let her back it up and dump it.

Bob: Shut up!

John: Move out of yo mama's basement!
by t_doffing July 27, 2009
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Jun 5 Word of the Day
A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.
17th Century setting: Due to his treatment of the "French Pox" (syphilis) with mercury a merkin Gwendolyn used a Merkin to used to hide the side effects of hair loss and not alarm her husband.
by David W. Tuthill December 30, 2005
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