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1.
A mild curse you say to a musician especially a guitarist. It is taken from an altered tuning for a guitar.
Dude1: I just broke a fingernail!
Dude2: Dadgad to your fingernail.
by MartinHB September 15, 2007
 
2.
the mental and emotional war that relatives of troops in Baghdad (or in other countries in general) fight at home.
Wendy's boyfriend enlisted in the army and was sent to Baghdad, where he died. Wendy deals with the dadgad of losing the one she loves most.
by Romance of Thieves November 08, 2009