Getting farted on during sex. (A sirocco is a hot wind from the desert)
Fuck, I got grossed out last night, dude! I was going the growl on my girl friend and she totally gave me a blue sirocco. She blamed it on the chili she had for lunch, but I think she did it on purpose.
A fairly specific word of limited application, it refers to the foreign matter (pine needles, leaf bits, bugs, poleen, etc.) that collects and floats in drinking water or soup or tea or coffee while you are camping. You strain or skim it off before you ingest the good stuff.
Tea's ready, hon! You'll have to skim the kife off yourself, but don't worry... it just adds extra vitamin K.