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back it up 

What a guy says to a girl he's fucking from behind - asking her to push her ass back so she grinds onto him.

Also, in lesser used context, it means a girl has a nice ass.
*A couple doing it doggy style*

Chrissy: "Oh that feels so good!"
Tom: "Oh yeah, you want it harder?"
Chrissy: "Yes!"
Tom: "Back it up, back it up!"
back it up by TJackson August 4, 2008

Back it up 

No, they clearly want me to murder children, therefore, give em what they want. If I don't get what I want you are going to get what you want.
Hym "And I'd like to see her back it up... Right up into me (if you know what I'm saying)."
Back it up by Hym Iam May 22, 2025

back it up like a Tonka truck 

To back it up and get down.

An ancient saying, originating in Mesopotamia, recently reintroduced by rapper Pitbull in the song 'On the Floor' by the Jennifer Lopez.
Moments after entering the club, Matthew backed it up like a Tonka truck.

Joseph ordered a root beer at the bar, then proceeded to back it up like a Tonka truck.

Back it up and dump it 

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!

Back it up, BEEP! BEEP! BEEP! 

To ask someone to repeat something which needs clarification.
Jerry: She said there's some tractor story that she hasn't told me about.

George: Woah, back it up, back it up, Beep! Beep! Beep! Tractor story?

Jerry: Beep, beep, beep? What are you doing?

back it up slow 

the act of a girl wanting anal sex.
i want you so bad but i'm on the rag so just let me back it up slow.
back it up slow by tungsten September 6, 2004