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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.
blab by PussyGirlsAreAnnoying April 28, 2022
What people say when people are talking very loudly.

ex: Mr.Pierson yells "BLAB" at us when we talk
Student: did you here about the school fight? Mr.Pierson: BLAB!! Student:My fault gangy wangy. Mr.Pierson: BLAB!!
BLAB!! by Boothehand October 25, 2023

blab-slab 

A cell phone, esp. a tricked-out internet cell phone.
Quit fiddling with the buttons on that blab-slab and get back to work!
blab-slab by Mesila October 17, 2008

blab casting 

Using any form of social media to spread stupidity to as many ignorant and gullible people as possible.
I'm so tired of liberal elites blab casting their bullshit to their idiot fans.
blab casting by Josie728 January 22, 2017

Blab daddy 

When a dude is giving you head, but also trying really hard to have a conversation.
The female equivalency being "blab gabby"
I was hanging out with Kyle and hoped things would get dirtier, but i just ended up getting a blab daddy.
Blab daddy by The blab daddy September 19, 2017

BLAB-ing 

When your friends ask you how you are doing, you tell them you are "BLAB-ing", aka Beastin like a boss
BLAB-ing by Raaaaaaaag May 3, 2021