This term is most frequently used to describe a female who was not blessed in the chest or booty region. In other words, the individual which this terminology had been used against most likely had a "flat" chest and/or butt.
by Charlize Justine September 23, 2018
by HuFlungPu August 22, 2008
by Ericthemasta November 15, 2007
Very drunk, but in a lethargic sense. The term refers to the vertical position of one laying down or passing out on account of heavy drinking.
"Man, I wish I hadn't drank all that gin before the party. I was completely flat the entire time we were there."
by paul22 December 13, 2009
by Glimm April 7, 2004