a flat shoe, looks like a ballerina slipper, that girls are wearing all the time. They can come in any color and with most any design on them. Causes = smelly, sweaty feet.
by anti-flat April 10, 2010
Get the Flatsmug. She is flat as a board!
or
She is flat as a brick.
or
Your mom is like a carpet, flat and always getting laid by Mexicans.
or
She is flat as a brick.
or
Your mom is like a carpet, flat and always getting laid by Mexicans.
by Tim Finney March 22, 2003
Get the flatmug. by Louisiplaya January 17, 2009
Get the The Flatmug. 
Get the flatmug. by Soma9 August 6, 2008
Get the flatmug. Used to describe soda that has been left out too long or is old, thus losing its carbon-doxide infused goodness that we like to call fizz. It is not good. It makes people sad.
flat's best friend and synonym is warm.
flat's best friend and synonym is warm.
by Dre March 4, 2005
Get the flatmug.