1. cascading pile of cellulite, usually located on the mid torso section of the body but in some rare occasions flabalanches have been reported in the jowl and thigh regions.
2. often associated with creatures that use the sir name jabba. see: jabba the slut
A: don't look now but your cousin is takin' off her shirt again.
A: that's got to be the biggest flabalanche i've ever seen! that's some seven layer burrito shit.
someone who is so fat they have a fatty at the front and not the back. there stomach sticks out further than their tits and their so monstrously big they are the oceans plug.
Dude, last night I flipped up some flabbajack and it stank like it hadn't been washed in months... so she had to settle for some flabbalingus!!! A mans gotta do what a mans gotta do when its time to pay rent!!!!