The act of having sex with a crease, fold or other indentation in the flabby flesh of an obese person.
"flubbing - to find a fold and fuck it"
Probably from 'flubber' - flab + blubber
"Oh God! He's off flubbing with that buttertroll from before isn't he?"
"He suffocated while attempting to flub her back-tits"
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