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 24, 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 March 28, 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 23, 2005