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Used to describe the action of checking a girl out with the intention of being inconspicuous but being completely obvious. Derived from the slang term, casing the joint.
Jimmy was casing the Korean girl walking across the street using his sunglasses.
Kanye was casing the booty all night long.
Casing by Gloryboyzentertainment February 22, 2015
Or casing sausage, is when you get out of the pool and your shorts are sticking to your legs so tight that it looks like they vacuumed sealed your penis, and it becomes a very visible outline.
Girl at the pool: Hey, do you see that guy over there?
Friend: Yeah, why?
Girl at the pool: Look at his shorts, he is totally casing.
Friend: Yeah, look at it, its pretty big.
Casing by MrPastello June 23, 2015
the act of 'huffing' in to a girl's pillowcase after it's been freshly washed.
One might also be tempted to wear the pillowcase on one's head for the hit of the whole case.
Stop hogging that case man. You've been huffing it for ages.

I've got a freshly washed double duvet cover for a two-man full body casing session.
casing by Angoleiho July 22, 2006
Or casing sausage, is when you get out of the pool and your shorts are sticking to your legs so tight that it looks like they vacuumed sealed your penis, and it becomes a very visible outline.
Girl at the pool: Hey, do you see that guy over there?
Friend: Yeah, why?
Girl at the pool: Look at his shorts, he is totally casing.
Friend: Yeah, look at it, its pretty big.
Casing by MrPastello June 23, 2015
The act of putting one's penis's head into another's foreskin. Similar to docking, except you seal it for good with glue.
Michael and David are casing each other with hot sticky gooey glue as they exchange French kisses.
Casing by Blazamuel June 13, 2024

casing the joint 

checking out a home, car, object etc...looking to see what could be stolen..
Some wackjob was casing the joint when I left the house.
casing the joint by zincink August 15, 2006