someone who makes a habit of joining in on other peoples conversations.
person1: did you hear Stevo routed Sheela.
person2: really, how interesting, please tell me more.
person1: well i saw them hooking up and then...
retard, walks up to persons: "really? who was this?"
person1: fuck off you stupid joiner
person2: what a bender
by disclosemyname? October 22, 2007
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When there are three or more restroom urinals and another guy walks up to the one next to you.
Jim's a joiner, he loves to size up the guys in hopes of getting something.
by b4urn March 14, 2020
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Someone who joins the gym in January as part of a New Year's resolution and by February is back to being a couch potato.
I can't get a treadmill until February because the January Joiners are all using them.
by Brent Michael January 16, 2006
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Shawns/Joiners are typically insane, ridiculous individuals. They like playing Team Fortress 2, but only if by playing, you mean HAXING. They were some of the first people to use words like "Fail," in real life and they're the only people who can fit the word "Headshot" into any conversation. They also do very good impressions.
You will usually be able to recognize a Shawn/Joiner from across the room by his ability to tell of his latest TF2 adventures for at least 10 minutes at a time, in a variety of voices, primarily using the stereotypical "Spy" accent.
Shawn/Joiner
Ash: Did you hear that Shawn kid with a funny accent in the second row talking about "headshot"-ing people? Is he a Russian exchange student?

Alex: No, he's just talking about his latest conquests in TF2.

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Rode: Joiner, quit talking about your video games! I need to start class!

Joiner: Nein!
by AJ^2 January 19, 2010
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People who spend the whole year eating like there is no tomorrow, however, they rationalize it by convincing themselves that they will join the gym after new years. Also known as CHUB CLUB. By mid-january they are nowhere to be found.
Gym rat to gym rat: Gosh I hate it right after New Year's when all the January Joiners come in and take up all the machines!

Later in February: Thank God the chub club is gone and we can use the precor during peak hours
by XBevil January 19, 2006
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a person who joins a gym as a new years resolution but may or may not continue going after the early months of the year.
Jake: Hey Bill want to go work out today?

Bill: No man, all those january joiners are hogging all the treadmills.
by decemberjoiner January 15, 2009
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Someone who hogs the whole gym in January, but then breaking thier resolution by mid-Febuary
january joiner, in early january: I HAVE TO GET TO THE GYM PRONTO!!! NO TIME TO WASTE, THE TREADMILL IS CALLING!!!

january joiner, in mid-febuary: Fuck the gym, where's the chips?
by Kristin and Kristen Company November 8, 2006
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