When you sit at an occupied table with the intention of making them move by being loud and/or annoying.

Aka: Scaring people away from a table
Friend: "There are no free tables for all of us...what should we do?"

You: "Let's go to that one and Chair Scare them"
by BobertLife October 23, 2011
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Any chair over which you put a paper bag with a mean, ferocious face drawn or painted on it over the back part.
A scare chair is especially frightful if someone breaks into a house to put the bag over a chair and doesn't leave a clue as to who did it.
by Impetigo Kid July 28, 2008
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