Literally means "huh?" in Japanese. Popularized by Kenshin in "Rurouni Kenshin" when he uses it in funny situations.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)

When your really confused or hit and act like kenshin himura.

A Japanese expression of confusion. Often used by otaku to indicate confusion/disorientation. People who read/watch "Rurouni Kenshin" may pick up the habit of saying "Oro!" because Himura Kenshin says it often in the manga/anime.

A term Kenshin uses when confused or minorly hurt

A word used when suprised or confused.

it's a word used by the main protagonist, Kenshin, in the anime, Ruruoni Kenshin as an expression. it doesnt really mean anything in particular but it does get it's meaning from the manner in which the character says it.