OMG OMG OMG
I've been looking for this for ages
but actually it's just a track where the singing has been muted (you can totally hear Juicy J at the beginning)

YASSSSSS

Oh my god it's so good.. The build up

I don't think it's official, I think it's pieced together with snippets of the real instrumental and parts that were just filtered out in audacity using an unofficial acapella. VERY close tho.

Edit: It's definitely not official

It won't play for me.

Oh looooord im twerking and I cant stop!

Edit: Now I'm doing the ICONIC lean and I cant stop

You can hear Juicy in the beginning

this is far from the instrumental it's a fan made