Top Definition
An incorrect romanization of the japanese, "Good Morning!". Ohayou is the correct spelling (the u is silent) and is the informal version of Ohayou Gozaimasu.

Ohayo is used among friends and people who are of similar age.
Friend: Ohayou, Daiki!
Daiki: Ohayou!!
by torabisu July 14, 2012
Japanese for "Hey"
More casual than Konnichiwa which means "Hello"
Person 1: Ohayo Gozimasu

Person 2: Uhh... What?
by JustAUnicorn January 22, 2012
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