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Not kosher. Plain and simple. Doesn't mean anything else. This can mean literally not kosher, as in not adhering to Jewish dietary laws, or not kosher in the more metaphorical sense, as in not legitimate. The latter usage definitely falls into the category of slang.

Sometimes spelled 'treyf'. It's a transliteration from Yiddish.
Literal: Pork fried rice is treif.
Metaphorical: Mike's urine test was treif. He use'd Bill's piss because he was tokin' last Tuesday and didn't want it to show up.
treif by Yakityak December 9, 2008
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a treif-jew 

this is an amalgamation of the terms a treife and a jew. It's a term of derision or insult, usually used by jews against other jews, to define 1) a jew who behaves and acts like a goy or 2) a jew who has converted out of judaism into another monotheistic religion.
two jews meet on the street and one of them is eating a Black Forest ham and cheese sandwich.

jew a) how dare you eat this junk, you a treif-jew, you are disgrace to judaism.
jew b) thanks for reminding me, but please just stuff it and be on your way.
a treif-jew by Uncle Dimma December 1, 2011
Related Words

treinzsetter 

Somebody who leads the way in fashion or ideas.
Used to label the head of tré clen
not to be confused with: tranzsetter, Trent Alexander-Arnold
'Wow, that is such an original idea! You truly are a treinzsetter!'
treinzsetter by louafsique June 25, 2020

treefiddy 

Chef's dad: Ooh! It must've been about seven, eight years ago. Me and the little lady was out on this
boat you see, all alone at night, when all of a sudden this huge creature, this giant crustacean from the
paleolithic era, comes out of the water
Chef's mom: We was so scared, Lord have mercy, I jumped up in the boat and I said "Thomas, what on
earth is that creature?!"
Chef's dad: It stood above us looking down with these big red eyes...
Chef's mom: Oh it was so scary!
Chef's dad: And I yelled, I said "What do you want from us monster?!" And the monster bent down and
said "I need about treefiddy"
silence
Kyle: What's treefiddy?
Chef's dad: Three dollars and fifty cents
Chef's mom: Treefiddy
Stan: He wanted money?
Chef's dad: That's right. I said "I ain't giving you no treefiddy you goddam Loch Ness monster! Get your
own goddam money!"
Chef's mom: I gave him a dollar
Chef's dad: She gave him a dollar
Chef's mom: I thought he'd go away if I gave him a dollar
Chef's dad: Well of course he's not gonna go away, Ne! You gave him a dollar, he's gonna assume you got
more

Triple Treiber 

When during the act of fornication the man take his phallus and places it in the ass hole of an accepting partner then the vagina to the mouth.
Kate: Why do a choco taco when you can order up a triple Treiber! It’s only $5 bucks extra.
Triple Treiber by RoxanneLoves69 November 10, 2019
A quiet, handsome guy with a mischievous side to him that makes his friends laugh. Treighs love their family and enjoy all holiday and vacation occasions that bring family together. Treighs have a few really close friends, but many people who he likes to hang around. A Treigh likes social gatherings and the opportunity to have a good time with friends. A Treigh is athletic. He prefers team sports over individual competitions, but appreciates all sports.
You've been Treigh-ed! That joke was awesome.

We need a Treigh on our team.
Treigh by knowatreigh November 19, 2012
a dislesxic stealer purhson thad dunt spel too gud.
Stob thut theif!
Theif by n November 17, 2003