the reverse of liposuction.
a) Where you have such a skinny ass that you can't keep your pants on and you need to have fat pushed into your body.
b) what someone who is too skinny needs to have a normal body.
Jack: Look, you can see Hannah's crack when she is just standing there. She can't keep her pants around her waist.
Jill: Yeah, I know. If she got lipopushion they'd stay up.