What does ICYMI mean?

Other definitions of ICYMI:
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How to use the term
ICYMI:
"I didn't want to spoil end on the movie for you ICYMI."
References:
ICYMI - a web series by engadget
- A Website that mentions "ICYMI."
"ICYMI is a daily clip show designed to dig up the offbeat and interesting stories that get buried by the biggest headlines."
- Check it Out
More slang terms:

FW
An abbreviation standing for 'f*** with', indicating approval, support, or that something is likable.

IFWU
An acronym that stands for "I F*** With You," which has been used as a song title and is an extension of "fw" which means "f*** with."

YH
An abbreviation of 'yeah', expressing casual agreement or acknowledgment.

Tripe
Nonsense or foolish talk, typically dismissive in nature.

Ratchet
An adjective describing something or someone crude, obnoxious, or disgracefully uncouth.

Ate
Performed with exceptional skill, style, or confidence, demonstrating excellence.

Dutch Oven
A crude prank in which someone traps another person under bed sheets after flatulence, creating an unpleasant situation.

Fishing in the Dark
Engaging in romantic or sexual activities secretly, usually at night.

OMD
An acronym standing for 'Oh My Days', an expressive reaction used to convey surprise, disbelief, or dramatic annoyance.

TMU
A texting slang acronym for Tell Me Upfront.

Bubble Guts
A sensation of noisy or unsettled abdominal discomfort, typically preceding a bout of diarrhea.