And if you don't move your hips up prior to jumping up but rather while jumping up, you just did a sprawl, which is what you do in wrestling when a guy is under you or tried to get under you (it's the classic counter for leg attacks).
If, however, the guy is on top of you - front or back - you can do a sit-out instead:
Lots of ways to get up from the floor, there are better and worse options for each situation, whether you just want to get up, dump weight off of you or stand up under a weight.
Cheers
Period.