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Pronounced " eye-shit "

An acronym for "I said it so it's true".

An isisit is therefore the kind of person who justifies the truth of something on the basis that they said it.

This obviously goes way beyond circular reasoning because it usually comes with negative slurs against people who don't agree with the point of view of the person.
Bill: Obama is a racist liberal who wants to make our country a muslim communist state

Chuck: I don't think so. How can you say that?

Bill: Well, you're disagreeing so you're just like him. I don't want any of your commie libbie shit, so go live in some other country like Cuba or Iraq.

Chuck: Pish! You're just an isisit!
isisit by izzywizzy May 29, 2010
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Soviet Isistan 

Unrecognized state created by radical chechen jihadists which decided how nice it would be if it would be legal to keep slaves, commit rape on a daily basis, chop people you disagree heads off and toss homosexuals from rooftops. Rest of the world, including Chechnya itself didn't understood this idea and began bombing the hell outta them for some reason.
Again mass media channels showing this Soviet Isistan propaganda, ffs i took enormous effort to lift my hand a press button on my remote control to watch Game of Thrones porn and assasinations, not some caucasian weirdos porn and assasinations.
Soviet Isistan by 32121 July 23, 2016
As part of the singlish vocabulary, 'issit' is a term that replaces the two english words 'is' and 'it' when used in a question.
"Fuccckkking hungry and bored lah..."
"At nine'o'clock go bubble tea and karaoke issit?"
issit by Winston Chan October 13, 2004
Amalgamation of the words "is" and "it", used either to(worryingly)signify an exclamation or to a question in itself.

Highly meaningless expression favoured by both chavs and certain asian/black cultures often found within a similarly indecipherable banter.
Shreena - "Oh ma gosh! He was like, all ova her and like, she was like, geet off me! Like.."
Rita - "Awwww, issit?"
Shreena - "Yea, and I'm like, daz sum ova sheet..."
issit by tee-hee April 4, 2005
A girl who is EXTREMELY fashionable, great with makeup, has a bunch of guys waiting to do what ever she asks. This girl has many friends and she always manages to make them look great and find them a guy to "talk" to but like all other normal human beings this lovely gal has massive insecurities which might not bring her to the best of her abilities.
Guy #1: OMG! that girl is so hott,, who is she?
Guy#2: Thats Isist she's new.
Guy#1: and H-O-T-T
Guy#1 & Guy#2: mmmm
Isist by Rawri November 22, 2011

issitt synrome 

Originates from a mythical creature that lurks in the dark depths of Mawsley. People say the beasts head is so thin that it once collapsed into itself. It can turn sideways and seem invisible as the body of it is so thin. Watch out for this bony creture as it may use its powers to touch you, especially if your a man, while he is invisible
The creature mentioned above.

issitt syndrome 

a rare incureable disease which causes gayness. common symptons are thin heads and bonie bodys
tom issitt from mawsly
issitt syndrome by dave January 28, 2005