mwahmwah /mwɑː/ interjection informal 
the sound of a quick kiss, especially an air kiss (=when your lips do not touch the other person) – often used humorously to suggest that someone is not sincere: 
Everybody was going ‘mwah’ and ‘darling!’
the sound of a quick kiss, especially an air kiss (=when your lips do not touch the other person) – often used humorously to suggest that someone is not sincere: Everybody was going ‘mwah’ and ‘darling!’