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An extremely expressive word that basically means "You would've thought" or "Sike".
Person 1: I got a 95 on that test
Person 2: Damn I got that 50
Person 1: Yo you trash
Person 2: Yayert, I got 100
yayert by Globbimus Prime May 19, 2018
Correct spelling would be Yi-Ei-Man

The term is directly related to the terms Aye and Aye Aye

It was a phrase that the people of the north of the Britians, developed as a sort of war cry when Vikings were attacking their coastlines.

The Britians used to yell the words "Yi-Ei-Man" to the attacking Vikings, which mean literally "No, Always, Man"

The phrase was intending to imply that the Britains would never join the Vikings crews and would fight to the death down to the last man.

In modern times the words have completely lost all meaning and the phrase is just a sort of slang way of agreeing to something - ironically exactly the opposite of what it should be.
Fisherman "The Vikings are coming"

Clansmen "Y-Aye-Man"
Y-Aye-man by claymuir September 21, 2005

yayeetskeet 

When you pull up to someone’s house while doing a drift and scream yayeetskeet out the window
Guy 1: YAYEETSKEET
Guy 2: what are you doing??
Guy 1: GET IN!!!!!
yayeetskeet by I broke ur neck November 23, 2019
A very funny and athletic person who cares about other. She is often found hanging with her best friend. Yayey is a cool person to hang around and if she likes you you’re real lucky. She’s a keeper.
Yayey by Me1263 September 27, 2023
The word 'Yayeah' means either that you think something's awesome or you're just R E A L L Y ! excited about something. For some awesome examples, check the examples.
He: "So, how was your day?"
She: "Not too bad, wanna have sex?"
He: "YAYEAH!"

- another example -

She: "So, how was your day?"
He: "Not too bad, wanna have sex?"
She: "No."
He: "Wanna have some shoes?"
She: "YAYEAH!"
Yayeah by I'm Awesome nr. 2 August 13, 2011