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1.
A person who looks at the screen on the back of their digital camera too much - word derives from the noise they often make - ooh, ooh ooh, look there's a good one!
He's not a skilled photographer, he's just a chimper!
by David A Clark July 10, 2005
 
2.
A gay guy who rushes around behaving erratically in an attempt to behave more outwardly straight.
"he's going chimpers"
by lars October 08, 2004