look up any word, like the eiffel tower:
 
1.
Verb. meaning to Walk Tall and Smile Big much like the Ghostbuster's Stay Puft Marshmallow man! A way of encouraging others to be positive about a bad situation.
Dude! I know your girl left you, but you have to stay puft, and move on!
by LiL.Blue June 22, 2009