Listen to the sound clip Onii Chan Audio75 from Onii Chan Soundboard: Onii Chan Audio75 Onii Chan Audio75 This sound is from Onii Chan Soundboard Onii Chan Soundboard. Definition: A strikingly sexy male friend, who all girls fawn over. A word used in replacement for the male friend's name whom you drool over so dearly. In Japanese, Onii-chan means older brother, and is a title of… Go to the full soundboardwith more sound clips Search