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1. The act of having sex with someone that is fat.

2. Two fat people having sex.
1.
Person1: Yeah, we decided we're going to have sex.
Person2: You mean you and that fat chick?
Person1: ....Yeah
Person2: Oh..Well..Urm..Have fun flubber fucking!

2.
Person1: Oh god they're doing it again. I can hear their fat slapping from in here.
Person2: Oh no! Flubber Fucking!
by JusLilOleMehXD February 24, 2011
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