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
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A Big-Dumby-Nigger is a tall, stupid, black person.
The tall, black man with his shirt on back to front walked past.
Linda Shouted: HEY LOOK AT THE Big-Dumby-Nigger
by Subterraneo July 28, 2009
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what you are if you actually search this up (and a quote used by egg)
dumby: 1+1=1
random passerby: what a dumby
by koolkidgamer69 July 30, 2021
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Have You Seen That Dumby Walking Around Not Knowing Anything
by Mikeeppsbaby January 25, 2019
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A person who you feel is very sexy and want their nudes
Girl 1:omg he’s such a Dumby
Girl 2:ikrr I wanna see his thing
by nickarula May 20, 2023
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Being really dumb to the point where its too dumb.

Mostly used on the females. Dumbo would be used for male, as men remind me of elephants: Dumbo
Brother: Your such a Dumby

Sister: Thanks Dumbo
by Animecookies4 April 20, 2021
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