The same act as Cheesing. That is to say, huffing cat urine, excreted when marking a cats territory. It is a much easier and subtler way to get high than using illegal substances. The results are that of a great acid trip, immediately transferring the conscious to the boob universe. It's pretty awesome there.

When you stretch out your nut sack and pay a hooker to do a line of cocaine off of your stretched out sack.

Huffing Cat Urine. It is called Cheesing because it is Fon to Due.

It causes a euphoric state where the user hallucinates. Such hallucinations include, but are not limited to, flying through space, driving rocket cars, meeting women with rokin' tits, flying on squirrel dragons, saving said big breasted woman etc. Usually 80s heavy metal power rock is playing in the background.
You also get to fight in the Breasturary, and swim in the fountains of Varnuf with the Itty-titty fairies of Mammary Mountain, as well as fight the boob-goblin in the Gozonga Cave.

20% of students between the ages of 6 - 12 have said they have tried it at least once.

Other slang terms for cheesing:
The Cheese Game
Vitamin Cheese
Mary Jane Piss in yo face fun time.

How to tell if your child is Cheesing:
1.) Your child seems distant, preoccupied.
2.) Your child's face smells like cat urine.
3.) When you see tigers at the zoo, your child starts grinding his or her teeth.