The Shisha effect is when a person thinks they're bad/hard/gangsta/a rebel, etc. over something that is actually quite the opposite.
It comes from the fact that people who smoke Shisha act as if they're smoking weed and are such rebels, when in reality anybody could smoke Shisha and it does nothing to you.
"Look, Abi just uploaded a photo on Facebook of her smoking Shisha".
"Pstt, she's got that shisha effect man".

"I just left Mark a nasty message on facebook hahaha, I bet he gets scared when he reads it".
"Please, your on that shisha effect".
by HazzaLM June 10, 2013
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