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Unbelievably sketchy. All the time.
Justin by joe.mommaaaaaaa June 13, 2011
Usually a man whore that hits on allll the guys.
Guy 1: "Hey look at the Justin what a gay man. "

Guy 2: "He may be gay but that manwhore is amazing <3"

Guy 1: "WHAT!?"
Justin by -TheKing- June 10, 2013
some one who gets mad over EVERYTHING. some one who is a liar and a cheater. some one who cannot keep a promise worth shit.
Ewwww, he cheated on you & then lied to you about it? what a JUSTIN!
justin by awerty December 15, 2008
A huge faggot. Usually one with a small penis that satisfies his/her (could be transgendered) needs by hitting on men.
Oh my god i was walking down the street and some fucking Justin started hitting on my grandpa.
Justin by Fagbashers inc May 1, 2008
A. The biggest douche bag in the entire world.. Usually a cheating lying asshole.

B. pulling a "Justin" (lying to go cheat)
A. Girl 1: I dated a Justin once..

Girl 2:.. Bad luck on that one..

B. Guy: Yeah dude i pulled a Justin last night...
Justin by BaddestBitch<3 August 13, 2011
The act of taking a really long, upwards of 15 minutes, dump while at work.
Where is Pat?
He is taking a Justin and won't be back for a while.

I'm going to take a Justin, so call me on my cell if you need me.
Justin by jmw02 September 22, 2016