Daggy

One who unintentionaly, through stupidity, thwarts the efforts of himself or his group.

John: Theres a warthog comin' in the base.
Tom: I'll get it, I got rockets!
BOOM!
Console: Betrayal, Betrayal, Suicide.
John: Ugh! You're such a Daggy!

by Dom Cruise April 10, 2007