Hella behind
Is commonly used in place of "really" or "very" when describing something that you're far behind in something that you were supposed to be doing.
I'm hella behind on this paperwork, I hope it's not important enough to get me fired.
Hella heads behind you
You got hella niggas/bitches tryna get with you
Tyler:you got HELLA HEADS BEHIND YOU
bianca:wym
Tyler:you got hella niggas tryna get with you
bianca:wym
Tyler:you got hella niggas tryna get with you