What is Back It Up?
1.
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!"
See
Random Words:
1.
the combinations of a penis, vagina, and testicle.
"Dude, i totally just grew a penivagesticle"
See vagina, testicle, balls,..
1.
V. The act of knocking on your neighbors doors in the middle of the night when you are completely drunk off your ass and not remembering..