"Dude, I was with my girlfriendyesterday 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.
When a person uses an app on their smartphone (or iPad) to "check-in" at a business, destination, or popular point of interest. If a person checks-in, it usually lets other people know where they're at via a social media channel such as Yelp, Foursquare, Facebook, and in some cases Twitter.
(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.
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.
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.