Expression of amazement to such a degree that a simple 'wow' just can't cut it. First known to have appeared on an episode of the (excellent) British sitcom 'The IT Crowd'.
Bill: Hey Ben, I just grew an enormous talking sunflower!

Ben: Chairman Wow!

Freakish Talking Sunflower: WEEED
by Dr Dougalstein September 22, 2007
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