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8.
A lactating cow
"I couldn't put my garbage outside because there was a dempsey by my mailbox"
by colapowa August 25, 2008
 
1.
A very good, clean fighter. Often seen in street fights
John: That was a wicked fight
Ted: YA fosure, the winner was a Dempsey
John: Give me my money bitch
by Potato Salad September 28, 2007
 
2.
a diner that appears to be a Denny's ripoff, but is actually the shiznit since Dempsey's was founded 5 years before Denny's.
I used to flip burgers for a living, but now I work at Dempsey's and also flip chickens and omelets, peel potatoes, and fry fries and chicken fingers. Now I'm a serious pimp.
by Nick D February 21, 2003
 
3.
Dempsey is a surname of Irish origin.

Dempsey is a variant of O'Dempsey, first recorded as Dempse in 1526. It represents the Anglicized form of the Irish gaelic Ó Díomasaigh (male) or Ní Dhíomasaigh (female)
Niamh Ní Dhíomasaigh (Niamh Dempsey)
Seamus Ó Díomasaigh (James Dempsey)
by Ms. Ní Dhíomasaigh July 09, 2010
 
4.
A Dempsey is a male or female that pisses after every drink of beer. They have thimble sized bladders and usually squat when they piss
Wow, sorry guys I have to take a Dempsey.
by Harry O' Nutz April 01, 2011
 
5.
- A big fat asshole who looks like a giant fucking dick with a turtle shell on his back and a dick in his ass.

- Is a dick. Enough said.
Guy 1: Big hairy scary gay Gary Dempsey the douchebear gave Drew Bisson a big fat load in his ass.

Guy 2: Yep. That sounds like Gaybear dempsey.
by BHSSucks2311 September 04, 2010
 
6.
A child-eating, porno-hungry, sex-addicted, beastiologist who performs open heart surgery in the nude. He has a very very large wang (if you look at it at a microscopic level). But everyone loves him cuz hes sexy and cool. Word.
"I awoke from surgery and there was a Dempsey standing above me eating a child while watching porn on a nearby television. I called Lassie to see if my heroic dog would save me, but this Dempsey ended up having sex with her. My life sucks ugh."
by tightmoanzz August 25, 2008
 
7.
when someone makes a joke and fails
man your such a dempsey
by iAmMcLoViNbOoK January 06, 2011