(noun, verb)Accidental, explosive diarrhea; usually associated with children, traveling, or food poisoning.
"Dude, while I was baby-sitting your kid, he had a poonami in his pajamas. I had to stick him, fully clothed, in the shower."
(noun) The effect of having that first drink the next day, after a long night of drinking, and it gives you a good buzz right away. Much like how quickly the shampoo lathers as you apply it the second time.
Whoa, dude, I'm gettin' a heavy shampoo effect from this morning's bloody mary.