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Italian noun for underline a quiet situation or to calm a person that is nervous for something that he did or that he's going to do. The verb is "stare sciallo".
Scialla! --> Quiet!

Stai sciallo andrà tutto bene --> Be quiet everything is going to be allright

Era scialla/o --> It was quiet
Scialla by Ziotopo March 10, 2009
If you know a Scilla you might as well have won the lottery because every moment with her will be a priceless adventure. Scilla is very beautiful, out-going and kind, however, if you get on her bad side, she might slash your tires. But don't worry, you probably deserved it. Scilla probably loves to rock climb and is a phenomenal artist. It is physically impossible to hate Scilla. She truly is one of the rarest individuals you'll meet.
"You won the lottery? Yeah, that's cool, I guess, but I met a Scilla."
Scilla by Minerva Greene November 14, 2022
1) A kid that has a chode
2) A kid who power lifts and tends to breaks walls accidentally
3) A kid that thinks he is da coolest
I was chilling with a Sciolla the other day. Kid was a power tool .
When you get fucked in the ass by your life choices, hitting rock bottom.
Jack: Where the hell did you go wrong?
Zac: I don't know.
Jack: You got sciulla'd
Sciulla'd by BoiDafaqqq April 27, 2017

Scallamanga 

Name given to a third nipple, or a person with a third nipple.
Ad "Hey check out my thrd nipple"
Ash "Scallamanga!!!"
Scallamanga by Bashers June 13, 2009

scallabummknee

Who is that guy that keeps running backwards when he gets the ball...Yeah, dudes on scallabummknee status.

Look at that scallabummknee trying to beat the brakes off that dude...He totally missed that tackle.
scallabummknee by coxtheox September 6, 2010