An expression of suprise or mild annoyance also used in an attempt to scare unintelligent and intelligent people, either by shoutng very loudly or pointing out the lack of a `U` after the `Q`
QWAH-the sound one makes when clearing one's throat vacating it of any substance slightly viscous but mostly sticky that may be in the back of one's throat for example the morning logy the evening after cigarette phlem or a well known yet unnameable substance of similar viscosity.