An all-purpose, informal, cutesy interjection with a contextual meaning ranging anywhere from surprise, to delight, to dismissiveness, to irritation, to sadness, to confusion. As it's a "cute" word, it's rarely used to express serious sentiment or anger. It can also be used as a noun, again to express the same range of sentiments as above. (Tonal intonation is key.)

the thing that you don’t have when you’re phones percentage is over 20

The standard abbreviation for Penis-Whack (also known as masturbation). This can be used once or repeatedly, usually while imitating the motion.

Also can be slang for good or awesome things that occur.

A better more sensible word for Muah.

An interjection used to express derision or scorn, in a scoffing manner.

A measurement of the coldness of a body of water, named after the noise one makes once submerged in cold water, “Pwah”. The amount of times you pwah is the measurement.