When one person prematurely trys to open the passenger door on a vehicle while the driver simultaneously trys to unlock the door, causing it to relock and keep the passenger outside.
"Hey man let me in the car already, it's cold out here!"

"I've been trying to, but you've lockblocked me like 5 times in a row now!"
by Stytches June 02, 2005
Using the Armor Lock in Halo: Reach to kill an opponent. This phrase is most appropriately said after the death of said opponent.
After he deployed the armor lock in Halo and killed me last night, he was screaming "Lock Block!" through his microphone...
by Trogador May 14, 2010
The phenomenon that occurs when someone is trying to open a car door while someone else is trying to unlock the door at the same, resulting in a still locked door. Followed by repeated attempts and pointing and laughing.
Person waiting for the door to unlock: Hey Rick, unlock the door already, you bastard.

Person with the keys: I would, if you kept your crab covered hand off the handle and stopped lockblocking me.
by Bort125 December 12, 2010

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