v. When an almost-empty bottle of shampoo is turned upside-down, and the shampoo that collects at
the bottom spills out too fast when it's opened.
n. A
practical joke involving urinating in another person's
shampoo bottle. Also see shampee.
1. "God, I hate when I'm low on shampoo. I have to turn
the bottle upside down."
"
This is a problem how?"
"Well when I open the bottle, it tends to shampiss all over."
2. "That jackoff slept with my sister and never called her, so I made him some shampiss when I asked to use his bathroom
yesterday. Serves him right."