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β€œi can do this all day~ back it up back it up”
Make a wish - NCT U
β€œBack it up bbygirl😩πŸ₯΅πŸ’¨β€οΈβ€œ
β€œpushing my ass or the kpop music?”
by FuckSM October 29, 2020
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Apr 2 Word of the Day
Music so good it could elicit sexual arousal.
The new We Came As Romans albums is chock full of bonerjams.
by lpvitus October 28, 2009
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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 TJackson July 12, 2008
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