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Handshake style greeting used by rockers. Also used to replace the high five as a rockin' alternative.

See step-by-step pictures: http://www.clubber-lang.co.uk/5.html
rock lock by Jennifer Nash November 6, 2008
If you with it, you is. You'll know what dis shit means.
Lock Rock by Mo F January 20, 2020
Vertical blade play on pocket-knives.
Yo, this M-Tech knife I picked up from Wal-Mart has crazy lock rock.
Lock rock by Ethel Mertz October 21, 2020

Cocked Locked and Ready to Rock

A loaded gun with ammunition or a round in the chamber of the weapon that is cocked and hammer locked (if single action) or ready to be fired by simply pulling the trigger.
Often a carry handgun with a loaded magazine that has been cocked locked and ready to rock. It is ready to fire. If a single action pistol the hammer has been cocked back and locked in place. Only the trigger must be depressed to fire the weapon.

Locked, cocked and ready to rock 

Totally prepared and/or anticipatory for a particular engagement. Generally used in the positive sense, for an event which one looks forward to. More euphonic than similar cocked locked and ready to rock.
"Dude, you still good for that party over at Jay-Jay's?"

"Shit, nigga -- I'm locked, cocked and ready to rock!"

rocklocks 

Rock meaning Flint ignition for Black Powder guns and Lock means the trigger mechanism
"rocklocks" means a Flint Lock gun
rocklocks by billw_willy June 15, 2009