Top Definition
The verb form of "Grunstep" meaining to be listeing to a new underground genre. spawned in New York city that has hence spread to the suburbs. This new wave of Grunstep is quickly invading the computers and sound systems of men, women, children, and aliens alike.
Jacob Grunberger is "Grunstepping" across the country as he goes on college visits.
by General Zapatista Schwag April 17, 2009
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