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1.
Salutation to one man or woman. Derived from Salutation to more than one man or woman.
Your friend picks up the phone and says hello, your reply "hi guy!"
by Stevie Macnamara June 16, 2004
 
2.
The common greeting gesture of a Fillipino when he/she has no relevent conversation to engage.

The greeting of a relative(normaly of an uncle) whom does not currently know or care of ones name despite the gender of the person it is directed to.
As Aaron waved to his uncle his uncle said in a robotic fashion "Hi guy". . .

by Merch-the-miggity August 03, 2006