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1.
A natural phenomenon in which an individual sneezes or feels compelled to do so shortly after looking at the sun.

see also: ACHOO syndrome

(Autosomal Dominant Compelling Helioophthalmic
Outburst Syndrome)
guy #1: Look! Up in the sky!
guy #2: It's a bird!
guy #3: It's a plane!
guy #4: ACHOO!... sorry... Photic Sneeze Reflex.
by Xx13Lucky13xX February 22, 2011