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A large, unattractive female who is sexually aggressive and dominate toward her male companion, often in public places resulting in uncomfortable PDAs (public displays of affection).
Common traits of the Knob Shark include but not limited to poor hygiene, inept socially skills, colorful locks of hair (greens, blues, or purple) and dark clothing. A Knob Shark will often out weigh her male companion by 40% or more.
Did you see the knob shark that Bob bought to the party? She practically had him pinned to the couch.
by gravymonkey February 08, 2009
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