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N. V. S. S. is when you get head from a girl from North Vancouver and right before you blow your load, you put your face right in hers and blast your cum straight up her nose like she owes you money.
I did the N. V. S. S. in the back of a taxi and the driver asked if I was done or if I needed a tissue.
My cousin tried N. V. S. S. and his girlfriend ran out screaming like she saw a ghost.
I did N. V. S. S. in a bathroom and the guy in the next stall asked if I was doing the sniff test.