"Checking" simply refers to indicating one's interest in acquiring something or seeing what it is all about. On hip-hop forums, "checking" is usually expressed in "im/im not checking for it" in terms of being interested in downloading and listening for the latest album from a particular artist. If you dislike a particular artist, you can let everyone know how disinterested you are by saying "im not checking for it" to indicate that even though you can download the album for free, its not even worth your time
P. Diddy might have a new album coming out but hes wackimo, im not checking for it
We're going to need fivehookers for tonight. Check that, get seven.
By Peta
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.'slocker.