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check in 

(1) To tell a correctional officer you're in fear of being physically assaulted by other prisoners and want to be placed in protective custody.
(2) To threaten another prisoner, so that he has to tell a correctional officer he's in fear of being assaulted by other prisoners and wants to be placed in protective custody.
The shot caller decided to check in the guy who got caught stealing from B.J.'s locker.
check in by Tochterlieber January 5, 2017

Check in 

Determining if someone is all right or on task.

Asking everyone in a meeting to tell one by one how they are doing.
I'll check in with you after work.

We'll start the meeting with a check-in to see how everyone is doing this week.
Check in by Cassidy Vall May 11, 2011

check in 

Used in jails and prisons, to "check in" means to request a transfer into protective custody. Protective custody is an area within a prison or jail where security is tighter and officer presence is more pronounced. Protective custody is used mainly for rats, people with mental illness and sex offenders.
Johnny checked in the oher day after the guys in his block found out what his charges were.

We told him last week that if he didn't check in, he would be sorry that he came to our pod.
check in by Shaneoj August 26, 2007

Check In 

To reflect on your status or position, and ensure that your attitude is aligned.
Encore @ The Wynn European Pool
Maida: oh my gawd do you see that old lady in the pool flashing her boobs
Debbie: I don't care how much she paid for those titties, no one needs to see that.
Maida: She needs to check in and put those things away.
Check In by phon3guy September 4, 2014

Check In 

When a fuckboy periodically txt you or call you every other day or week to check in on how you are doing and if he feels that he is losing you to someone else, he will proceed to ask a bunch of questions to draw you back to him
Real man will always want to know what their woman is doing, to see how her day was and be there when she is having a bad day. Don't be that dick who check in on his girl every other day and pretend to be interested.
Check In by YourBFsMainCheck July 29, 2017

Check-in 

To "Check-in" is in a sense, the opposite of "checking someone out."
"Dude, I was with my girlfriend yesterday and this Nice Ass Chick was walking by, I really wanted to look at her, but I had to "Check-In," to my lady. Shit.
Check-in by Vanilayak August 27, 2009