Top Definition
A form of a cappella dubstep created by making womp womp noises and random techno noises with ones mouth. Typically involving lots of drops and high pitched screechy noises. When heard people will spontaneously join in. It is dubstep, just un-plugged and acoustic.
Oh shit did you hear that dubstep Ian just played? Bro that was mouthstep, he made it... with his mouth.
by dubcrazed21 November 06, 2011

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