look up any word, like darude - sandstorm:
 
1.
all mods(modders)are bastards

often used on forums, the word is used to show mods that someone dislikes them.
škafet began to use it on forum.hr first, before it was popular
A: oh my god I've been banned
B: AMAB
by Škafet January 31, 2009
 
2.
Assigned Male At Birth
Even though I was AMAB, I'm a woman. I'm a transwoman.
by p3ngu1n78 May 24, 2011
 
3.
Used in internet forumes, AMAB is an acronym meaning "All Men Are Bastards"
User 1: My husband slept with his secretary
User 2: AMAB
User 1: Yeah.
by Fume Troll May 06, 2008