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1.
At or around noon time.
"What time is the meeting today?"
"Noonish."
"Ok see you around 12, 12:15."
by Edmund February 20, 2006
 
2.
Middle-Eastern slang for vagina, or more specifically, the clitoris.
"Ali likes to pinch my noonish when I climax."

"His tongue reached unbelievable places in my noonish."
by TyMariMo February 22, 2010