Definitions by LegendaryFWD

Chapter 139 

Shingeki no Kyojin chapter that introduced birb eren, armin talk no jutsu, and simp ymir

Person 1: Did you read SnK Chapter 139?
Person 2: TATACAW

Chapter 139 by LegendaryFWD April 12, 2021

birb 

the form eren achieved in the 139th chapter of Shingeki no Kyojin

Mikasa: Jean is coming over tonight, but that birb is on my window all day...
birb: tatacaw...tatacaw...tatacaw

birb by LegendaryFWD April 12, 2021