Hmm, my favorite insult to a guy is one spoken by the legendary Cher in Witches of Eastwick. I've had the opportunity to use it on 3 men in my lifetime.

You are the most unattractive man I have ever met in my entire life. In the short time that I have known you, you have demonstrated EVERY loathsome characteristic of the male personality and even discovered a few new ones. You are physically repulsive, intellectually retarded, you're morally reprehensible, vulgar, insensitive, selfish, stupid, you have no taste, a lousy sense of humor and you smell. You're not even interesting enough to make me sick.

I NEED to write this down.

*seconds that!*

I'll have to add my thirding there.

used this one on an ex before:

Listen to me, you disgusting pathetic little boy. If I wanted to hear a *name for horny female dog* speak, I'd tell my god (begins with a D and ends with an M) *(begins with an F and ends with a G) speak.

Used this one on another ex when I caught him cheating on me...with my best friend:

Him: "Baby, it doesn't mean anything. I swear"

I looked at my best friend and smiled.

Me: "Oh its okay. He's already up and ready for you. So go ahead. Take him for a spin. But keep this mind, you ****** (means fatherless son), this is what you're losing and THATS what you're getting. And let me tell you, honey. The last time I checked, that ***** had more ******* problems than a math book."

When someone brings up the "F" word:

"Oh wow. You're intelligent. I bet you were the smartest in your class, weren't you?"

I have many.

Assmonger is probably my favourite.

The single best one word insult is easily F***tard.

My favourite insult of all time was said by the great W.C. Fields when asked by someone he disliked to play golf, "When I want to play with a prick, I'll play with my own."

you herpies infested ass blister.

Ooo, nice one. *takes notes*

That's great.. but I can't say that or I'll get a weird look...

You can always call me your prick.

'You poster child for retroactive birth control.'

That insult makes me happy

Yaru Anata

thank you me and my friend had a 30 min discussion about that insult and we both agree it will now be used frequently by both of us

I tell all of my friends they should have been swallowed.

I hope you bleed from your ass and die the most painful death.

Whorebag.

heh, Lenore makes me feel special inside.

the one I let off the most is oh you complete "fudge"wit.

but a friend of mine sums it up nicely in
"I wish you would fall over and explode."

Wow, if any of you actually went on like that with me, I'd probably just punch you out. Most of the insults here.. let's just say their lameness outweighs your Mom. With the exception of asshat, Erion's one, f***tard, and Sobran's.

I also like "If you were any dumber they'd have to water you."