A Sarcastic insult that is used in various ways. It is usually used to express someone saying, being, having or doing something lame or stupid in a kind of subtle way. It is also used by salty kids or if someone happens to disagree with you and frame it with "imagine." This phrase is commonly used amongst zoomers for the most part.
"Imagine thinking dabbing is cool in 2020"

"Imagine being trash"

"Imagine being bald."

"Imagine supporting this."
A song by Jogn Lennon about the perfect world in John's eyes. Found on the album of the same name, and every Lennon compilation. It has been covered by several artists.
"Imagine there's no heaven, it's easy if you try"
by Samuel W, August 11, 2005
A gaming term. Used in particularly by the NBA 2k community for a specific occurance that happens, but ultimately should not happen.
Ronnie: *shoots a contested three pointer* “Green!”
Me: “Imagine that goes in”
by GoCrazyBayBay January 22, 2019
there is no definition, you must imagine it
imagine it i know your not imagining by reading this you little shit
by this username sucks August 8, 2021
A sarcastic word used to form mental images of things not present to the senses. This word was invented by Lil ignorant.
Lil Ignorant: Yo imagine if Lizzo pulled up on us and shot us in the neck.
Friend: Wtf.

Lil Ignorant: I just ate milk before cereal, nah all crazy imagine.
by Urban jewel & co. October 14, 2020
The moment where you imagine hugging Channing Tatum with his clothes off and you make a weird face and body position. Your hands are in front of you and must look like they are gripping his gorgeous butt.
I walked up to a random person yelling "IMAGINE" as I made sure that I looked weird then walked off. They would never know I was trying to be sexual.
by The Green and Gold Unicorn April 13, 2013