2 definitions by icechris

Top Definition
Masturbation in the AM. Generally results from morning wood
"I woke up to a nice my morning jack-it"... "you mean like the band?" ... nope
by icechris August 30, 2011
Similar to how adding water to a nearly empty shampoo bottle gives you "more shampoo", giving a small amount of alcohol to someone who was very drunk the night before, returns them to a drunk state.
Bro 1: "Damn, why is Alex so drunk right now? He's only had two drinks."

Bro 2: "It's the Shampoo Effect, he was plastered last night."
by icechris February 06, 2012

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