To have something under control. Same with on point. Doing something really well, and having it be all yours.
Yo if you have that girl "on lock" just ask her for her number ma boy.
by BigPimppin6906 November 23, 2017
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This game is locked
The test I'm taking tomorrow is such a lock
by ReaganP September 30, 2005
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A special gathering or sleepover that takes place in a building from dawn 'till dusk, or 12 hours. At the beginning you're doing a bunch of activities and games, watching the movies the chaperones provide, until usually 9 hours in. And at this time everyone becomes either testy, zombie like, hyper, or bored. Usually the activities cease (except for the video game tournaments and the movies) and everyone falls asleep or just talks about a boring subject. By this time the food is all gone, so everyone is scavenging for any scrap of sugar.
The lock-in started at 7 pm and ended at 7 am. I think I passed out at 4 am.
by TestyWhenHungry April 23, 2011
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1)to be under really strict, severe obligations or rules
2)to have somebody under control
1) \"Yo,i can\'t go outside man, my parents got me on lock, unda sum really strict shit yo.\"

2)Girlfriend:\"Come here, now!\"
Boyfriend: \"Im coming, sorry i can\'t go right now\"
Boyfriend\'s friend:Damn dawg she got u on lock
by vh_bkbombshell April 27, 2005
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Oh shit, Locke just shunned me from #central.
by Anonymous January 20, 2004
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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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