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1.
mixture of wow and how, used only where both are appropriate.
"I just ate a whole wheel of cheese."

"WHOW!?"
by Richard June 19, 2006
 
2.
pronounced Wa-How!

An expression of utter surprise. Best used in extreme cases
"Whow Charlie! That foghorn is amazing! Can i let my Aunt borrow it?"
by courtneypbell September 18, 2005
 
3.
pronounced wa-how,
whow is a word used by homosexuals to show excitement. first heard by elton john in 1996.
"Whow! These jeans make my butt look might fine. Don't ya think so Steve?"

"Why yes they do Billy"
by Munited4life January 20, 2009