I Find That Slightly Amusing

Used instead of lol, lmao and rofl. It is a more accurate way to describe the feeling you get when someone says something amusing in an instant message or text, but it doesn't actually make you laugh out loud, laugh your ass off, or roll on the floor laughing.
AIM conversation:

Person A- "So guess what happened today?"

Person D- "What?"

Person A- "I forgot to do my homework, haha"

Person D-"IFTSA"
by Brostar March 2, 2010
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