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1. lock-in
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
2. Lock-In
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.
3. lock-in
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."
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