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Your angry and about to kill everyone.

Other definitions that are similar:
pull a JFK
get my finger paints
What you say about my mama!, lets shoot 'em up!
by Pistol Starta February 14, 2004
n. - an act of a homosexual nature that equals or exceeds 54 men kissing at once.

Derived from the semi-famous "Shootemup" character in World of Warcraft who was noted for consistently posting his homosexual experiences on forums and instant-messaging conversations.
"He totally shootemuped me when he grabbed my butt."
by Silrani November 28, 2006