Hip-hop song in juniors department

It's a couple black guys singing, the main singer is pretty young (late teens, early twenties?). Some of the lyrics sound like:

(Pre-chorus)
Hey, girl you know what to do
somethingsomething
(chorus)
She like the way I do it/I like the way she do it
somethingsomething stupid
Her swag's so exclusive(?)
Got a body like hoo-hooo

I work at Kohl's but EVERY time this song comes on (and I'm not stuck at a register), I try to go see who's signing it, or write down words, but I ALWAYS am busy or get sidetracked. hahaha I've been telling my fiancee about this song for like...a month now because it sounds like a song he'd like...but I can't even find the song for him to listen to it! I NEVER have trouble Googling a few lyrics and finding a song, but it's just noooot working with this one!
PLEASE some one respond! haha

hey the song is by the group Final Draft and its called "do it" =)

Thank you!! That's it!