1. The sound made when pecking someone on the lips.
2. The word said when kissing someone quickly on either the lips or the cheek, or anywhere else for that matter.
3. Said over online chatrooms, emails, text messages, phonecalls, etc to symbolise a kiss.
1. ::Mwah:: Jonny kissed Jane on the lips.
2. 'Mwah' Jane said as she kissed Jonny.
3. 'Love you, mwah!' Jonny typed in an IM to Jane.