to finalize a decision or plan
Let's make sure Greg's cool with tonight before we lock it down.
by lottanyx February 11, 2010
When you find out that a girl/guy you are dating is into something really cool and unexpected so you must make them your gf/bf.
Guy 1: "So this girl I scored wants to go see Iron Man 2 and go shooting!"

Guy 2: "Dude!! Lock it down!!"
by RedandGreen May 02, 2010
Shut the fuck up and calm the fuck down, please.

Traditionally used on a film set, but also useful for stopping multiple friends, lovers, and strangers from doing stupid, often alcohol-induced things.
"Hey, give me five dollars and we'll grab that mannequin's titties."

"LOCK IT DOWN."
by ABlair January 13, 2008

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