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1.
One who has a DySfUnCtIoNaL ReLaTiOnShIp WiTh ThEiR ShIfT KeY. They think it's cool. NEWS FLASH: It's not. What, did you skip elemetary school?
Me: Hey. Whats up?
You: NoThInG MuCh. JuSt HaNgIn OuT. YoU?
Me: Ok, no. Here's a dollar. why don't you go buy your dignity back? Nobody likes a Shifter.
by MBequalsHeart November 16, 2005
 
2.
Your arsehole.
Guy 1: dude, whats that smell

Guy2: sorry man, those beans I had made my shifter sneeze
by chongo November 01, 2013
 
3.
noun -

a term used to describe a woman that when engaged in sex shifts her body in such a way that breaks a man's penis.

The woman could be a sadist or just an inexperienced, sex-crazed lunatic.

Empirical evidence shows that they are a very clear and very present danger to dicks everywhere. You've been warned.
Doctor: "What have we got"
Nurse: "Another fractured penis"
Doctor: "Good God! This is the seventh case this week. We have a serial shifter on the loose!"

Guy 1: "Damn, that girl is fine."
Guy 2: "You don't want none. That's a shifter if I ever saw one."
by BilltownHustler September 17, 2013
 
4.
The first pint of beer consumed after a work shift is over, usually sold at a fraction of the price of a regular pint.
Greg: "Hey Bill, can you give me a ride home after we get off work?"
Bill: "Sure, but I want to grab a shifter over at the cantina first."

OR

"Hey guys, the bar across the way is doing shifters again, lets go when we get off work."
by adirondak February 16, 2012
 
5.
a biscuit or cookie type snack...made from bran...just pure bran. good substitute for laxatives
Alex: oh man i was on the crapper for hours after eating that shifter.
Josh: Haha yeh my mum makes some killer shifters!
by bofredlington January 31, 2006