These are all ones that I quote (or paraphrase) regularly while playing vids:
From Aliens:
"Get away from her, you *****!"
And also:
"I say we dust off and nuke the entire site from orbit. It's the only way to be sure."
Some more:
"I came here to kick ass and chew bubblegum. I'm all out of bubblegum."
- They Live
"Time to kick ass and take names."
- Knights of the Dinner Table
"YOU SHALL NOT PASS!"
- Uh, Star Wars, I think? Not sure
"Once more unto the breach, dear friends, once more!"
- Henry V
"Cry 'Havoc', And let slip the dogs of war"
- Julius Caesar
OK, this one isn't badass, and it's just a meme, not a quote, but I say it whenever I die stupidly:
"I regret nothing!"
And here are some more random badass quotes:
First, a bunch from Army of Darkness:
"Good, bad...I'm the guy with the gun."
"Alright you Primitive Screwheads, listen up! You see this? This... is my boomstick!"
"Well hello Mister Fancypants."
"Yo, she-*****! Let's go!"
"Groovy."
And some others:
"Whose side are we on? We're on the side of the demons, Chief. We're evil men in the gardens of paradise, sent by the forces of death to sow devastation and destruction wherever we go. I'm surprised you didn't know that."
- Colonel Saul Tigh, Battlestar Galactica
"You can't make an omelette without ruthlessly crushing dozens of eggs beneath your steel boot and then publicly disemboweling the chickens that laid them as a warning to others."
- General Tarquin, The Order of the Stick
"You come at the king, you best not miss."
- Omar, The Wire
"Okay. You people sit tight, hold the fort and keep the home fires burning. And if we're not back by dawn... call the president."
- Big Trouble in Little China
"Yippe-ki-ay, ************."
- some guy in some movie, I don't remember
This last one requires a little background: Philip II of Macedon was invading ancient Greece. With key Greek city-states in submission, he turned his attention to Sparta and sent a message: "You are advised to submit without further delay, for if I bring my army into your land, I will destroy your farms, slay your people, and raze your city." The Spartans sent back a one word reply:
"If."