I looked up the script for the episode:

Archer: "Nobody's gonna hurt anybody. We're gonna be like three little Fonzies here. And what's Fonzie like? Come on T'pol what's Fonzie like?"
T'Pol: "Cool?"
Archer: "What?"
T'pol: "He is cool."
Archer: "Correctamundo. And that's what we're gonna be. We're gonna be cool. Now Ringo, I'm gonna count to three, and when I count three, you let go of your gun, and sit your butt down. But when you do it, you do it cool. Ready? One... two... three."