look up any word, like ratchet:
 
1.
crocodile
Look at all the flat dogs on the riverbank.

The Zambezi is infested with flatties.
by George McBob May 11, 2009
 
2.
When a meat-head or bro tackles a smaller person so that he can violently rub his head on their head. The purpose of the flat dog may be homoerotic in nature.
Sean, stop flat dogging Kyle. He's about to cry and you have a Texas-sized erection.
by JeffGoldblum May 19, 2011
 
3.
A group of DJs and hipsters who determine the future of pop.
Flatdog is the future.
by jgeffen March 08, 2008