An acronym for the phrase "I fucking love you." Typically used by prisoners receiving hand jobs under the table during visiting hours, horny 8th graders and fans of the 80's rock band Whitesnake.
Erin, IFLY. Meet me in the first floor bathroom so I can finger you. Or,

I can't believe you traded an 8-ball for third row Ratt tickets. IFLY!
by Professor Foreplay May 3, 2009
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An Abbreviation for the Iowa Flyers Swim Club, the fastest and most hated club team in Iowa. They consistently are the highest scoring team in the state at national level meets and are often accused of recruiting swimmers when all of their team members have came without being contacted by any coaches on the team.
Guy 1: Hey did you hear Steve just changed teams to IFly? I bet they were recruiting him hard

Guy 2: Unlikely, IFly doesn't pull that shit, that's just what slow teams say when they lose to them
by CPGaming October 26, 2014
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The ifly anal inflator is an innovative rectal pleasure maneuver that was first practiced by a man that goes by the name Parker T from Battleground Washington. To exercise the maneuver properly, the user must boost to the top of the indoor sky diving wind runner, drop their drawers, spread their cheeks, and inflate their rectal cavity through the high pressure airflow.
Instructor: “hey Parker, put you pants back on and get back down here. The ifly anal inflator is prohibited at this location.”
by Bobdooker June 26, 2023
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Me and my friends and family always say to each other I Fucking Love You. I even heard it thrown around at parties and bars, even in movies.

So when chatting online having to type it out constantly was a pain so I started just typing IFLY and when someone wants to say it Back they say IFLY2.
"Hey man IFLY." "Yea dude IFLY2"
by Kemical September 10, 2013
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