Definition of mwah exclamation from the Oxford Advanced Learner's Dictionary

 

mwah

 exclamation
(also mwa)exclamation
BrE BrE//mwɑː//
 
; NAmE NAmE//mwɑː//
 
 
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used to represent the sound that some people make when they kiss somebody on the cheek More Like This Onomatopoeic words beep, bleep, boohoo, brrr, buzz, click, clip-clop, ding-dong, hiss, mwah, peep, ping, plop, pop, rat-tat, splat, splosh, squeak, squeal, squelch, swish, tee-hee, thud, thwack, tick-tock, toot, vroom, wham, whoosh, zoomSee worksheet.
See the Oxford Advanced American Dictionary entry: mwah