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2.
Abbreviation for the TV show Avatar: The Last Airbender. Also written ATLA or AtLA. An incorrect and unacceptable way of abbreviating the title would be ATLAB. The B is added by the ignoramuses of the fandom who don't realize that 'Airbender' is ONE WORD.
Writing A:TLA instead of the full title saves a lot of time when texting you're friends to alert them that the show is starting.
by Elisa Paz February 02, 2008
 
1.
is an acronym for the popular show, Avatar: The Last Airbender, airing on Nickelodeon.
She's mostly writes fanfictions for A:tLA and LOTR
by Monica =P January 03, 2008