Everything in the helicopter insertion at the start.
Like this dialogue:
Blain: Bunch of slack-jawed faggots around here, this stuff'll make you a Goddamn sexual Tyrannosaurus - just like me! Poncho:(showing his gun) Then strap this on your sore ass, Blain. (Billy laughs)
"I ain't got time to bleed!" "You got time to duck?!"
After setting up traps for the Predator, the team is hiding in the bushes waiting for it. After waiting too long and startled by a bird, Dillion says to Dutch, "What you gonna try next, cheese?" Dutch gives him a mean stare and Dillion just rolls his eyes.
Mac killed a wild boar, thinking it was the Predator.
Dillion: Jesus, you killed a pig! Poncho: What the..? You think you could have found something bigger? (Billy laughs) Mac: Fuck you, Poncho! Fuck you!
"Long Tall Sally. She's build sweet. She's got everything just like the Chinese! I'm gonna have me some fun. I'm gonna have me some fun. I'm gonna have me some fun."
"You are one ugly motherfucker."
Helped along by the Predator's reaction - given the way he roars back at Dutch, you'd almost think he understood the insult.
After being startled by a flying bird... thing, everyone pulls out their guns...except Stans:
*Pulls out a shiv, looks at the others* "You know what? This is bullshit! I want a fucking gun! *turns to Cuchillo* C'mon man, gimme a gun! You've got two fucking guns! *turns to Nikolai* C'mon Russian, you've got a big fucking gun!
"When I get back... I am gonna do so much fucking cocaine."
Edwin's nonchalant agreement with what Stans says next only makes it funnier.
Edwin points out a tattoo of a naked woman on Stans:
Edwin gets the best line in the whole movie. After being used as bait to try and lure one of the Predators into a trap (i.e., letting him be chased through the forest), he stops, catches his breath, and bellows: