Badass Line as you kill...

[UBERfionn]

So you know you've been chasing the bad guy for ages, you've just cornered him and then you say something.
You know something along the lines of:

"Give my regards to St. Peter, or who ever has his job, only in hell!"(1 Internet if you get the reference!)

Or you know, something better.

 

[BlackJak007]

Say Cheese!*BANG*

 

[skitzo van]

"Killing is my Business... And Business is Good!" Its so obvious but so badass

 

[Dr. wonderful]

Dr. Horrible.

"Tick tock, here come the glock."

 

[failsauce]

The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who in the name of charity and goodwill shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who attempt to poison and destroy my brothers. And you will know my name is the Lord when I lay my vengeance upon thee.

 

[Jack_Uzi]

"It's only going to take me a split second to show you my big bang theory."

 

[Cody211282]

"you just got Sarged"

 

[Armored Prayer]

"Hey, watch this!"

That or one of the lines in TF2.

 

[Snowpact]

'I am Murloc, I am death'

or, of course, while lighting a cigarette after wiping the blood off of your shirt and your guns, inhaling deeply and exhaling:

'Put it on my bill'

 

[S.R.S.]

"I'll have what she's having!"

*BAM*

Bad guy dead and the last thing he heard were the ice cold words of death coming from my mouth.

 

[UBERfionn]

Dr. Horrible.

"Tick tock, here come the glock."

A good rhyme before death, nice.

 

[Joe Matsuda]

"This might sting a little."

"Hope you have friends in Hell."

"Don't worry, I'll find a way to bring you back to life...AND THEN I'LL KILL YOU AGAIN!!!!"

 

[Snowpact]

Also: I always find one phrase awesome enough to utter when I'm dealing major damage and bulletstorms:

'Bang.' said as casually as possible.

 

[rokkolpo]

''tell me if this hurts''

 

[nick n stuff]

"Killing is my Business... And Business is Good!" Its so obvious but so badass

MEGADETH kick ass.

only joking i'm not gonna shoot y...BANG

 

[Fenreil]

Hey , hold these bullets for me! In your gut!

 

[UBERfionn]

eat shit and die!

I'm gonna rip your head off and shit down your neck