Vulgar
The leader of this valley is very vulgar. The name of the valley is Vulgar Valley, so it makes sense for its leader to be very vulgar.
Imagine meeting the leader of Vulgar Valley. Imagine all the vulgar things he says to prove he is worthy of being the leader of Vulgar Valley. He is so very, very vulgar.
ぞく
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This vulgar leader leads his Bosozoku (ぞく) bike gang through Vulgar Valley, patrolling the area and spreading vulgarity as he goes.
Hear the motorcycles rev and purr as they carouse the Vulgar Valley. Hear the leader screaming vulgar things as he and his Bosozoku bike gang ride all around.