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1.
An abnormally blubber filled bubble shaped rear-end.
" Look at the mudshark, she has a nice blubble-butt"
" Damn daw, that grill is a mess,but I'd straight hit that blubble-butt"
by yaheardsound April 14, 2010
 
2.
a blubber inflated bubble butt, usually more jiggly and dimpled than normally desired.
It looks alright now but someday that blubble butt booty is going to fall and then it will just be one sad, saggy mess
by McOxford June 17, 2013