Chu

Origin

From the Japanese onomatopoeia ちゅっ (chu, "").

Full definition of chu

Interjection

1. (chiefly anime and manga fandom) The sound of a kiss.
• 1996, 12 August, Kathleen Webb, Re: Zoicite a guy!!!, By the way, isn't it interesting that the Japanese hear the sound "chu" when someone kisses? In the US, we usually say, "smooch," "smack," "smerp," or even "swock." Now, everytime I kiss my husband, I'm listening to hear if it sounds like "chu."
• 2000, 4 August, Fish Eye no Miko username, https://groups.google.com/forum/#!original/alt.fan.utena/xQRTdc90ZaU/SRyEPYTaWPgJ|Re:
• 2000, 19 August, Verthandi, https://groups.google.com/forum/#!original/alt.fan.utena/H84YUs9IwRs/uS1smE-8JdIJ|Re: a kiss to himself Chu! ^.~