a step child. Usually one that annoys the piss out of you and needs to have the shit kicked out of them.
Step Dad: I got home last night and the step kid was being annoying as hell
Man: Tell that dumb fucking dumby to shut the fuck up.

Step Dad: You won't believe what the Dumb fucking dumby did last night.
Man: You mean the DFD.
Step Dad: Yeah him

by step dad February 24, 2008
5 Words related to dumb fucking dumby

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