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.

Synonyms for back it up

On this page, you will find 30 slang terms related to back it up. Some of the top words include: Got'Em, BREAK MAH BACK, shove it, doggystyle, Brushing your teeth, and 25 more.