Acronym for "Thanks for the invite" used mainly in text's and Facebook Check ins.
Alex: Dude I went to the bar last night, ton of chicks.
Oscar: TFTI
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Phrase used to describe joy for the commencement of an event, the excitement for the beginning of something. Originated with the excitement one receives when getting a great deal on the famous coupon site Groupon.com
Alex: Dude, I just got a Steak dinner at Gibsons for like $20 bucks. Let's Go!!
Oscar: It's on like Groupon