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Person #1- Dude, you need to pay me back
Person #2- I fk
by Barnhart December 10, 2005
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3
I fucking know. Used in annoyance.
Clara got annoyed with Josh when he texted her “Do you know what a pencil is?” She said “Ifk!”
by Madelyn’s DEFFYS! June 23, 2018
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4
I f*cking know
Robert Ricard- Bro ifk that's not you
Victim- Why you taking pics of pus and sending me them and saying that's me
by Judlig Wan Beetjoven February 08, 2018
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5
Ifk is an abbreviation that stands for "I Fucking Know"
Used to be typed out as a way to signify that when a person tells you something funny

and you are excited to identify with their amusement from a joke.

Ifk can also be used as an exclamation of annoyance if a proposition was repeated ad nauseam or is obvious.
"Dude, did you see that face plant that guy did? was the funniest thing ever!"
"IFK man! hahaha"

"Don't forget tomorrow to bring beers!"
"IFK! jeez"
by Dave_Says March 20, 2019
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