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Squirrel for: Taking up arms (i.e. getting ready to battle).

First coined in the Sears Commercial 'Squirrel Revolt'.
(Man walks in with wife to display a bunch of squirrels cutting coupons for them)
(Head Squirrel flips table)

Squirrel: We're tired of you humans and your tyranny! Nut Up my Brothers!

(Squirrels proceed to attack the humans and vandalize their property)
by My pseudonym is already in use October 23, 2013