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The projectile, splattered on a bathroom mirror, made up of hardened puss, liquid puss, and blood produced as a result of applying pressure to a face pimple (zit).

This phrase is used to describe the shooting of fluid onto the bathroom mirror from a squeezed pimple.
"Come check out this Mirror Missile, it's gonna take a half a bottle of Windex to clean up."
by Shevus January 08, 2010
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