Top Definition
A Fat Amy is like a sugar mamma. She buys you those bad ass USMC tattoos and jungle boots, but she also tends to clean your plate, and your neighbor's plate, and your neighbor's neigbor's plate. You probably wouldn't date her if she didn't pay for everything and you weren't stationed in BFE Alabama where the finest women are married off at the ripe age of 14.
Cut to shower scene in Top Gun:

"Hey Ice Man, nice tatto of an ice cube on your arm"

"Thanks, my Fat Amy got it for me after I went down on her"

"Dude, its not that nice"

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