A freestyle competition between multiple people in which participants provide they're hardest dub (dubstep) using their mouth.
"WOBWOBWWWWWWWWAAAAAAAAA" Hard dub man, hard.
"WUBWUBWUBWUB'' Thats some filthy shit.
Grandad says to Grandson : I remember my first dub off.
''WUBWUBWAWAWAWOBWOB'' What the fuck is this kid on?