When you take a line of cocaine and place it in a black woman's ass crack and start sniffing. The black ass mixed with the white stripe gives it the appearance of a skunk while the blow in the ass gives it an unpleasant aroma.
I was down on 159th street with a dimebag and for $20 this black hooker let me go skunking.
The act of smoking Marijuana also known as weed while using the toilet especially when referring to smoking weed while shitting. Also known as a "bowl movement"