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The largely illegal state of a bar or pub during the period of time after last call, during which the bar is locked to all incoming would-be patrons such tha bar employees and a select group of friends can sit around and drink without all the annoying cash-paying customers bugging them.
this guy kinda blew her off, so she was all like "i need to croosh someone NOW," drags me down the sidewalk and five minutes later we're in a lock in with 5 guys
by Landau December 04, 2006
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a group gathering where you are "locked" in a building. It may include games, movies, but never sleeping! sleeping is for losers :oP
Lauren and Monica went to the lock-in and didn't sleep. They were up till 6am
by Monica Jo June 08, 2007
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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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When you don't want to do change or move something (including yourself).
"My mom told me I need to be less sarcastic, but I told her I'm lockin. I'm not gonna change how I act because i like it."
via giphy
by Vanilla Water April 20, 2018
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popular slang for a homodyne with an extremely low pass filter, which making it very narrow band. Usually includes a frequency mixer, and not to be confused with bandpass filter.
"That lock-in is essentially shot-noise limited."

"I'm using the reference from that lock-in because I don't have a function generator."
by novakyu November 25, 2007
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An overnight or extended period of time when a youth group is confined to a particular space in order for them to appreciate what might not have been expected.
The public library invited all middle schoolers to a lockin featuring a popular rock band.

Our youth group held a lockin last weekend with many cool events.
by Michael G. Terpstra, Ph.D. August 06, 2006
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Lock in - (noun)

The term used for when the pub doors get locked after hours for the locals. This is a more common occurance rural towns over England when the locals are allowed to drink and smoke after hours inside the pub freely with the landlords permission.

You know you’re part of a lock in when the blinds or curtains are pulled, the ashtrays come out from behind the bar and drinks are still being poured. This normally continues under the landlord discression as after closing time it is simply his property.

If you ever get the chance to attend one don’t turn it down, but never question what goes on.
Any of you boys fancy going to the pub tonight? I heard it’s going to be another lock-in.
by Raver666666666 June 16, 2018
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