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1.
On the social news website Reddit IAmA stands for "I am a" and AMA stands for "ask me anything".

In an IAmA post, a person will post what they are, and other people will ask the original poster about himself/herself.
As requested, IAmA man who was in an extended coma for a period of 4 months. AMA.
by UDEditorsAlwaysRejectMe February 02, 2012
 
2.
I am mildly amused.

An alternative for 'lol' when someone finds something amusing but isn't actually laughing out loud.
Person A: Yo mama's so fat, when she walks down the street wearing a yellow raincoat, people shout, "TAXI!"

Person B: iama
by abdzedz July 24, 2009