Shortened form of "Ohayou gozaimasu," the Japanese salutation equivalent to "Good morning." It is a
cute way of saying hello.
"Oha" was made
popular by a Japanese celebrity, Shingo Katori, on the TV show "Saturday SMAP." He uses it as his catchphrase, and used it in his song "Shingo Mama no Oha
Rock."
A
hand gesture usually accompanies an "Oha!" greeting. On the first syllable "oh", hold up your hands, palms out, with your index fingers touching your thumbs (like the American "
O.K." gesture). On the second syllable "ha," straighten out your index fingers and thumbs, and push your hands forward.