Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
"Mwah" Definition
noun
The hallmark sound of a fretless bass guitar played with a certain technique, where treble frequencies increase gradually after the attack.
Source: Wiktionary
interjection
Making the sound of a kiss; the sound used to indicate sending a kiss through the air; Frequently used in email, chat and text messages to indicate sending a kiss to someone.
Source: Wiktionary
Used to represent the sound of a kiss, typically one given in an exaggerated or theatrical way.
Source: Oxford Dictionary
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