To become high by way of snorting or sniffing cat piss. Cheesing can cause a psychedelic trip where the person cheesing visits a fantasyland where they get to fornicate with the boob princess. Trey Parker and Matt Stone discovered the miracle effects of cheesing.
To describe one who is high on cat urine.
Cheesing was the topic of episode 3 from season 12 of South Park titled "Major Boobage"
-Get the fuck out Kenny! Stop cheesing with Kitty-Kitty!
-I am cheesed out of my mind
-I will grab my pussy then we can go get cheesed.