Gap Fat 

the lbs and lbs of fat gained by general laziness combined with ready meals, takeaways and/or boarding school/workplace food consumed on your gap year.

It's just gap fat.

Gap Fat by gapfattie May 1, 2011

Gap Fat 

When you are fat and wear Gap clothes 'cause Gap is marketing to the fatties.

She is stylin' in her Gap Fat.

Gap Fat by Hey Joey Jo Jo September 7, 2021

Gap-Fatting 

The term used to describe the action of fitting a large object through a small gap, assumping the past tense of the word 'fit' is 'fat'. It's just funnier, alright?

Caitlin: You're never going to fit your car through that gap...
Me: Watch me.
Caitlin: That was some freaking awesome gap-fatting.

Gap-Fatting by WatchMe September 24, 2007