What is Sly Sign?
1.
When you put your middle finger up to somebody behind an opaque object (predominantly a door), releasing anger but not getting into trouble. Usually used by young teens, aimed at parents.
"My mom was being so annoying... so i sly signed her through the door when i left the room."
"No way dude!"
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The medical condition where a person's asshole nerve is connected to their eyeball nerve, giving them a shitty outlook on life.
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1. To misbehave terribly in the back row of the class, chewing pens, taking photo's, writing notes.
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