A person with a giant back, but an incredibly small penis. To make up for insecurities resulting from a case of babydick, a fat back will overcompensate and take advantage of any oppurtunity to brag about his or her hugeness, back or otherwise.
When everyone started talking about their penises, Mike the Fat Back quickly changed the conversation: "I'm the only one who can get this tattoo 'cause my back's so big"
A big ass.
Boy#1:Damn look at that girl son!
Boy#2:Ugh man I know she got a FAT Back!!
The flab that hangs over and around the back of a fat woman's bra. Also rolls of fat that incorporate the undrarms and shoulders of said fat women.
have you seen that chick eat? No wonder she's got a ton of fat back on her.
The layer of fat that runs along the animal's back. It's VERY salty, and yet you can't stop eating it.
I don't care that it's making my blood pressure sky rocket, pass me another piece of fatback!
the pubis area in which your pubic hair grows; the area above the penis or labia
"taylor couldn't reach cam's cock, because his hairy fat back was in the way."
Also a layer of fat that runs around an unhealthy persons waist
Tim, awww put ur fat back away your making me sick.