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
Stupid people who play among us in 2023
Bro imagine being among us dumbys
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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
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A phrase used to refer to the absolute coolest, epicest person on the whole planet.
Joey: There was group of dumbasses over there
Kyle: Don't you mean Dumbi?
Joey: Thanks for correcting me, Dumbass
what you are if you actually search this up (and a quote used by egg)
dumby: 1+1=1
random passerby: what a dumby
Dumb Ass Bitch Quick Meaning Dumb Bitch
Have You Seen That Dumby Walking Around Not Knowing Anything