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1.
when you eat a lot of food then suddenly feel the need to walk around because your're uncontrolably full.
marissa: oh my god im so full i ate so much!

emily: all right we are taking a fat lap around the place!!!
by LETTER Y EMBRACER July 07, 2011
 
2.
The process of driving around the whole town with the intention of finding something to do. Often performed under cases of boredom
me an shaun are gonna take a fat lap, be back soon
by Macasarus November 12, 2007
 
3.
the lap of fat that covers one private region.

That bitch's fatlap was so big, i couldn't see her twat.

Earl's fatlap made his penis look lik a vienna sausgage.
by christima August 27, 2007