IKYFL is a popular internet abbreviation that stands for “I Know You F*ing Lying.”** It is commonly used in texting, social media, and memes to express disbelief, shock, or strong doubt about something someone has said.
In everyday contexts, it adds humor or emphasis when reacting to surprising or unbelievable statements.
Origins of IKYFL
The slang IKYFL originated in African American Vernacular English (AAVE) and gained popularity through online culture, particularly Twitter and TikTok.
It became widely recognized around the late 2010s, often appearing in memes, reaction posts, and viral tweets. The abbreviation has since spread across different online platforms as a casual, humorous way of expressing disbelief.
How to Use IKYFL in a Sentence?
The term IKYFL is mostly used in informal online conversations to show doubt, surprise, or playful outrage. Below are five examples of how it is commonly applied:
- “IKYFL, you really paid $200 for that shirt?”
→ Expressing shock at someone’s spending choice. - “IKYFL, did they actually break up again?”
→ Used to show disbelief about gossip or news. - “You think pineapple belongs on pizza? IKYFL.”
→ A humorous way to reject someone’s opinion. - “IKYFL, I just saw him at the store yesterday.”
→ Reacting with disbelief to unexpected information. - “Wait, she said what? IKYFL.”
→ Emphasizes surprise and disbelief in a conversation.

Pronunciation of IKYFL
IKYFL is pronounced as ‘I-K-Y-F-L’ (letters spoken individually).
[Audio pronunciation here]
Words Similar to IKYFL
- SMH – “Shaking My Head,” used to express disbelief or disapproval.
- FRFR – “For Real, For Real,” to emphasize seriousness or truth.
- IDK – “I Don’t Know,” a common shorthand for uncertainty.
- OMG – “Oh My God,” expressing shock or surprise.
- No Cap – A slang phrase meaning “no lie” or “I’m serious.”