A Filipino slang expression similar to omg. Can be used in both a positive and negative manner. Used in informal coversations generally between friends socializing.

Is both like 'Oh my God' or 'Oh my gosh.'
Hay naku! grabe! ganda ka talaga (omg, damn/wow you're really beautiful.)

hay naku! bakla ka? haha. (omg, you're gay? haha.)

hAY NAKU!!! ur sooo pangit!!!! (OMG!!! ur sooo ugly!!!)
by ShawnLyn December 3, 2009
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it is a form of expression and is synonymous to 'oh my gosh' or even an accompany if you are sighing about unusual things.
Hai naku! Our new C.I is very cute and smart!
by Vastrins vennin August 28, 2008
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