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Blowing air out of your mouth, like blowing out a birthday candle, is just a DC form of talking.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
All talking is DC, unless you also speak while breathing in.
Speech, like all sound, is a wave that moves back and forth parallel to the direction of motion. This is the context that I describe it as AC.