Define Back It Up Meaning

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!"
By Dehlia
Back It Up
“i can do this all day~ back it up back it up”
Make a wish - NCT U

“Back it up bbygirl😩🥵💨❤️“
pushing my ass or the kpop music?”
“what”
“what”
By Dorolice
Back That Up
Expression used to show thanks or appreciation for something someone has done for you or it can be used after a business transaction has taken place.

Person doing favor: I got that green you wanted.

Person receiving favor: Back that up dawg.
By Kimberlee
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..."

--------------------

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 Salli
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.
By Tessie
Back-up, Back-up Prom Date
This is basically someone that you know will say go with you to prom if you ask them. This has to be a person that you can relatively stand for a full night, or else can stand to stand next while taking pictures and then ditch him/her for the rest of the night and hang out with that person that you actually wanted to come with. This has to be a person that you know no one else will want to ask, so they are definately available.

Steve is my back-up, back-up prom date, so I know that I am guaranteed to be going with someone.
By Dinah
Getting The Back Wheels Up
To stick your dick and balls into a pussy at the same time

Ive been getting the back wheels up a fair bit lately on my new cum rag
By Anthea
Back Up
There are 2 common meanings:

1/Used in military or police force: Reinforcements, support, help.

2/Computer using: create your secured data in case the computer goes down suddenly, mainly to prevent data loss.

1/Police officer shouts via radio: "Shot fired, shot fired. Officer down. Unit 26 to base, we got a situation here. We need back up immediately!" - "Roger, just hold on. Back up are on the way."

2/Before installing Smart Windows Care, we strongly recommend you to back up you data first to prevent yourself from losing important data.
By Eugenia
Backing Them Up For John
When cheapass loser fucking hillbilly thinks he is getting screwed out of overtime.

They are not giving me any jobs, the are backing them up for John.
By Rebeka
Back-up
A dancefloor technique to attract the attention of a partner. Essentially this involes backing your bootie towards your partner and getting close, often thrusting. This technique will initiate a grind type of dancing.

She's backing-up to you dog! Get in

Let's get on the dancefloor dog. We can back-up on those hotties over there
By Shani