Kalahari is the act of one grounding up marijuana and cocaine with a large stick while chanting random sounds and gibberish to a repetitive beat until a green/white powder is achieved.
Then, the powder is proceeded to be slowly poured into a glass of liquor as the surrounding audience chants louder and the beat (clapping, african drums, etc.) gets louder as well.
Once the liquid consisting of liquor (preferably vodka), cocaine, and marijuana residue is mixed and seems homogenous, the beverage is split between the audience to more random shouts resembling monkey noises.
After the drink is consumed, the participants will resume to speaking normal English (or the local language) and sit down and watch the Lion King.
The preparing of the liquid coupled with a viewing of the Lion King is the origin of the term "Kalahari." It will be the craziest night of your life.
John: Duuuuude, let's Kalahari tomorrow with our buddies!
Dave: I don't know man, that's pretty effing sketch.
John: Duuuuude, it will be so much fun! It's always been my dream to be butt raped by Pumba!
Dave: Dooood, sounds effing awesome! Lets do it!
John: Kalahari we shall! We shuold get your mom to join us!
Dave: Yeaaa duuude, surf's up bro.