mwah /mwɑː/exclamation 1noun 1 exclamation1 •The sound of a kiss, to indicate blowing a kiss to someone.Thanks guys. 3 kisses for you all: mwah mwah mwah! noun1 •The hallmark sound of a fretless bass guitar played with a certain technique, where treble frequencies increase gradually after the attack.Play it again, but with more mwah this time.