I can't believe nobody has beat me to this:
"Ain't nothin finer than a naked woman holding a gun!"

My iMDB profile
http://www.imdb.com/board/24297325/?ref_=fn_al_nm_1

Friends do not engage in sexual congress with EACH others' wives! Love the emphasis on "each".
See you in hell, candy boys!

They're gonna kill you.
They're gonna kill you.
What?
What?

I love the entire visual scene and the lines.
When Tulip shoots Michael Duncan Clark's character and Perry has that shocked look and Tulip tosses him a beer and Perry never even flinches as the beer flies by into the water and he's says bu..but why did you kill him?
I had to kill one of you.
Well you definitely made the right choice.

[Jimmy opens the door to find Oz and Jill standing there]
Jimmy: What is this Oz?
Oz: [deadpan] I dunno.
Paper snow. A GHOST!!

I hate the drill. So you just gas me, pull the tooth out and we'll still be friends! Ok?

Oh, and, "Maybe I have changed since my death."

"It's not important how many people I've killed. What's important is how I get along with the people who are still alive."

Phone rings
Oz: "Phone!"
Phone rings again
Oz: "There it goes again!"
Kills me every time.

I liked it when he was hiding behind the lamp

Jimmy, "so you like living in Canada?"
Oz, "No, I live here with my wife."

Jimmy, "You all right? 'Cause you look like you might have some gas."
Oz, "Well, I had a hamburger for lunch."
Jimmy, "Did they put mayonnaise on it?"
Oz, "Yes!"
Jimmy, "Can you tell me why they do that? Because every red-blooded American knows that the only condiment you are ever supposed to put on a hamburger is ketchup!! Or maybe some of that 'special sauce' you like so much here in Canada! Which I think also has some mayonnaise on it too. But I swear when they start slapping that mayonnaise on there I could kill someone!"

"Yeah i'm gonna keep the coke & fries but i'm gonna send this burger back. if you put any mayonaise on it, i'm gonna come over to your house and chop your legs off, set your house on fire and watch as you drag your bloody stumps out of your house ok pierre?" LOL my dad and i think that line is classic!!!!

Oz: You know what I'm gonna do? I'm gonna I'm gonna! I'm gonna GO!
Oh I also love this part that's not really a quote but a funny noice. Right after Oz realises that Jimmy is a hitman and Jimmy says something to him he just makes a funny noice like "Hebwlr?"
And I was laughing my ass off when Oz panics and runs into Frankie and then falls over a lamp

"You know I got this same car?"
"Really?"
"No."

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lol same. that was the funniest dialogue exchange in the movie