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I.A.A - I Am Amused. This acronym allows people to show their amusement via text in three letters with out saying LOL(laugh out loud) as they are generally lying when they say this.
Joe: lol that was funny!

Jack: IAA agreed, but did you really laugh out loud?

Joe: No, I normally dont. What does iaa mean?

Jack: It means I am amused so its more truthful than lol.

Joe: IAA cool i like it.
by K3V1N_7T April 27, 2009