When someone is constantly running their mouth saying stuff that doesn’t really make sense or is flat-out a lie.
MARK: That’s why you broke, got no drip, and get no girls

Timmy: Mark all you do is blab, I got dior and off-white while you wearing a cheap adidas fit looking like a soccer player. You also haven’t even had to first kiss stfu.
by PussyGirlsAreAnnoying April 28, 2022
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When a slime can change its shape to fit into small spaces.
DM: Yo, Can your slime blab fit?

Slime Player: You know it!
by Averyxstream September 3, 2017
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Person who blabs about a secrect the second after they have heard it. It is a condition and therapy may be needed
I stopped talking to him because he is a blab-aholic and told everyone.
by danadbug September 21, 2011
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