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.

a group gathering where you are "locked" in a building. It may include games, movies, but never sleeping! sleeping is for losers :oP

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.

When you don't want to do change or move something (including yourself).

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.

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.

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.