(Verb) The combination of looking something up and checking something out, lax style.
Ty: "Oh dude lemme check it up!"
to "hit" on a fine female that you see in a public place
OH, look at the fine young breezy over there... I am gonna go check up on it
to look up information on someone you don't know through Facebook or Twitter. Sometimes referred to as "Facebook Stalking"
Sue: "What does his new girlfriend look like?"
Rita: "I don't know, let me check up on her."
To make oneself aware of his or her surroundings and or environment
Bitch, ran through a red light and never checked up!
the act of deep throating a girl to see how far your cock goes down her asophogus
damn man this girl was real great man i gave her a check up and she's 100 % okay to go.
To excecute or perform an act of incredible destructive force, or disrespect to ones persona.
“Damn! I spilt my drink on the floor.”
“You better clean that shit before I Check Up! you!”