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"
by xchgsjhkd November 27, 2010

A big ass.
by Expierence February 04, 2010

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.
by jotthedot April 19, 2006

The layer of fat that runs along the animal's back. It's VERY salty, and yet you can't stop eating it.
by mima phat April 17, 2005

by gimmi mora head February 19, 2007

by Mr Melon May 24, 2005
