The face one makes when someone takes a picture of their face up close, or one takes a picture of his/her own self close up, hence "locking in" the face they're going to rock in the picture.

Also see "hot face" and "hot check"
Dude 1: Hey man im gonna take a picture of your face!

Dude 2: Hold on let me lock it in
by Phil Cook November 20, 2007
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John Locke is not the bald dude from Lost. John Locke is an English Philosopher who even influenced the American Declaration of Independence.

"omg john locke is so awesome"
"oh yeah, I read his book."
"omfg they have Lost books?"
"You lost your book?"
"What book?"
"..."
by g f b February 27, 2008
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when you have your boyfriend or girlfriend wrapped round your little finger.
i told him walk the ten miles to my house and he did because he is "on lock"
by deb July 1, 2003
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"cool"; something that is really great or good, awesome, dope, fun
Wow!, this party is locked!
by 3_amigas! March 18, 2016
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When you've previously met or interacted with someone, but you barely know them and every time you cross paths, you feel compelled to give them a nod or a quick hello. These interactions are awkward enough that you actively try to avoid them if you can.
Tyler: Fuck, let's take this other street today
Ryan: Wait, why? That way is longer
Tyler: I'm locked in with that guy ahead
by BrysonStrong August 3, 2023
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Enclosed and inability to escape.
When I was under 3, I was locked in wearing my my Fruit Of The Loom Dark Blue Stripe Underwear!
by Turo Fernandez October 28, 2020
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