When you really have to take a poop and can't, at which point your face starts to look like you are sucking on a lemon.
Vitor and Danny where walking down the street, Vitor turned to Danny and said do u have to talk a dump, you have a DUMPFACE.
by VBJUDGE202 August 14, 2011
2 more definitions
A unwanted or uncool animal, an animal with a dumplooking face...
Kiko is kind of a dumpface cat...
by JORM HOSTRO October 10, 2006
variation of game face, a mentality one gets into when breaking up with significant other
bro you know sharon is garbage i think it's time you get your dump face on and send that bitch to the curb.
by skineezy June 05, 2011