mwah-mwah
/ˈˌmwɑːˈmwɑː/ /ˈˌmwaˈmwa/verb
[no object] And with object. To kiss in exaggerated fashion, especially on the cheek; to give air kisses.
Origin
1990s; earliest use found in The Times. From mwah + mwah, apparently representing the practice of kissing on each cheek in turn.