A backwards baby. Someone, oftentimes in their late 20's/early 30's, who succumbs to a state of newfound arrested development.
"Damn, Rusty really likes talking about the Thundercats these days." "I know, he's become such a ybaB"

"Yo this Blu hits hard af" "Mom said that's not the way we deal, you ybaB! Quit vaping!"

"Fuck it I'm gonna be ybaB this year" "You mean a backwards baby?" "Yeah, that's what I said"
by Dong Draper February 25, 2021
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noun, verb, a trick or cheat.
I ybabed my way on that test. Or: That guy playing the video game was a real ybab.
by jeff minoob May 9, 2006
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Ybab is a little shit head that likes to suck chips and lick his ass hole. A ybab is normally always being a god damn fucking simp and is really high on 37 types of drugs.
"bro, did you see ybab shoving that mango down his fucking ass!" "No man thats fucking gay you shit fuck."
by BichAndTheFritoGoUpMyAss May 17, 2020
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