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to be in an extremely angry or agitated state
"My father was up in arms when he found out my sister became pregnant before she got married."
The teachers were up in arms over the scandal.
Foo Fighters song,one of the best songs ever
foo's new song up in arms is awesome
(v.) to arm oneself or a group to attack a force.
The militia took up arms against the invaders.
It means you’re the Fukin best and everyone knows u
Look *name* is 3 fingers up /arms crossed and 3 fingers up on each hand that means he must be the best