by Fiona McColl November 14, 2007

Someone who unfortunately interrupts your personal bathroom break time by using the bathroom stall directly next to you, essentially joining you while you do your business.
My bathroom time is my personal time I would prefer not to be bothered by a joiner.
I use the restrooms on the 25th floor because there are too many joiners on 26.
I use the restrooms on the 25th floor because there are too many joiners on 26.
by Tyy Webb November 17, 2009

by Bigokal June 21, 2007

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
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? November 07, 2007

At that party last night, there was a lot of Joinering going on!
Never let a guy get you alone in a room if you are drunk. He will most likely Joiner you!
Never let a guy get you alone in a room if you are drunk. He will most likely Joiner you!
by BelmontSlang October 25, 2011

by Luke Puke March 31, 2013

Term used to describe a stranger who tries to join your line at a club or tries to party with you and your friends.
Omg, did you see that girl? She totally was trying to pretend she was with us in the line. What a joiner!
by Pinkfarida September 06, 2010
