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A guy with a 1 inch penis.
Guy: how far did you get inside her?

1-inch Penis Guy: Justin...
by supamans August 30, 2010
A guy who is good as a friend, but you don't want to get romantically involved with. It will lead to potential disaster.
"Hey, you and that guy seem close, why don't you all date?"

"I just don't feel like I should be more than friends with him, he seems like a Justin to me."
by t-Waff April 01, 2010
One with a very small penis and no sex appeal.
Wow, he is such a justin.
by Funnyboi123456 January 23, 2011
name for a total douche bag of a person
OMG that kid is such a justin, he turned my computer off while i was typing!!!
by me,me,me,me,andme November 02, 2010
Justin, a HUGE doucher, a boy who deserves to die, sexy but needs to get a fucking clue about how to treat girls, he makes 13 year old girls fall for him and give him BJs, he pretends to care and will leave as soon as he gets your pussy, he's a genius but he's fail his freshman year 3 times, a pedofile, comes back as soon as you get over him, needs to get a life and treat people better. End of the description of Justin. (Not ALL Justins)
*Boy comes back after having sex with a girl and leaving her for months RIGHT after she gets over him FINALLY!!*

Boy" Hey..."
by rabidkitty October 04, 2010
complete faggot; usually short, skinny-ass, black haired douche bag who has yet to hit puberty. Sits on his computer all day and plays World of Warcraft like its his job; mad gamer. is typically involved in rec sports cuz he's not good enough to play competitively. overuses the word bro and his mom is a complete milf.
Matt: OMG that douchebag has been playing WOW all day long. When are his balls gonna drop?

Danielle: What do you expect, its Justin.
by Matty Matty the Big Daddy October 03, 2010
Jersey Shore wanna be. Needs to learn to shut the fuck up. Mad creeper.
Look at that Homo in the sparkly shirt! He must be a Justin!
by Ivanna Bebadd January 25, 2011