Open your eyes (adjective)
1. To contract the levator palpebrae superioris muscle, thereby drawing back the superior eyelid across the eye. Can be done either voluntarily or involuntarily, as in the blink reflex.
2. To consume near-lethal doses of hallucinogenic substances, thereby causing you to enter into a deranged, paranoid alternative version of reality.
Hat tip to @NazisNotWelcome for suggesting this one.