Drive-by check-in 

Checking in into an establishment on Foursquare when you're around the area but not really there. Usually done by people who just want to unlock badges or get mayorships.

Friend: "Hey, I saw you checked into Wal-Mart last night, I was there, but didn't see you!"

You: "Yea, that was a drive-by check-in. I just wanna make sure I was still mayor."

Drive-by check-in by Sharkyire13 January 8, 2012

Chrish check in 

When an old man books into a hotel at 10am with someone considerably younger.

Those two are here early... Must be a chrish check in

Chrish check in by Dutypizza October 27, 2018

Jyst check-in ing 

Basically just checking in....

ME: GOD where are you!!!!
GOD: JYST CHECK-IN ING

Jyst check-in ing by Money menash$$$$ April 24, 2019

Vegas check in 

When a programmer submits a large code change Friday night before leaving on vacation that breaks the mainline build.

*Monday Morning
Developer: "There are a bunch of changes that broke the build; looks like Paul's changes from Friday night. It's pretty complicated, 32 files changed. We should let him know so he fix it."
Developer Lead: "No can do. He pulled a Vegas check in and is on vacation for next 2 weeks, we'll have to rollback the change."

Vegas check in by anonymous December 15, 2022

in check 

1) Under control by someone else. Probably from a game of chess.

2) Under control, due to skills

"I got you all in check" -- Busta Rhymes

in check by AC February 2, 2004

keep in check

Noun:
1. To hold a person in your control.
2. To keep a person afraid of you.

"Ayo, gotta keep that bitch in check!"
"Nigga please, that little cunt is shitting his pants when he sees me, gotta keep the fuck in check."

keep in check by Dan K. June 5, 2003

in check 

Straight-Up Whipped!!!

I had my boy IN CHECK! He was carryin' my purse and everything! He's definately mine!

in check by YoUrSwEeTlIlHoMeGiRl August 7, 2004