The pieces of popcorn that don't pop even though you put 2 minutes and shake the bag. Flopcorn might seem like a bad thing, but if you think about it, flopcorn means less popcorn to steal flavor from the other popcorn, and a more buttery, saltier popcorn.
I ate all the popcorn and found flopcorn in the bottom of the bag, it was disappointing, but then I think back to how much better the other popcorn taste, then cheered up.
a word used to discribe someone who smells really bad, usually geared towards girls, if literally taken, it means a combination of the smells of fish and popcorn
'ah i wish that chick over there would close her legs, it smells like flopcorn in here'