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a person that doesn't understand something and totaly disregards it after it has been explained.
john: where did you lose did your phone?
ray: the park, but don't worry if someone finds it i'm sure they'll call me.
j: they can't.
r: why?
j: you don't have your phone, so they cant call you.
r: but it's my phone.
j:you DENSE motherfucker
by Dr. Ghostdad June 30, 2014
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Synonymous to having a thick skull. Thick skull means there's less space for a brain, implying you have a small brain and therefore you have limited mental capacity. Thus, a thicker skull means a denser one because extra thickness adds extra mass to the current volume of your head.

Density = mass/volume. When the mass of your head increases from being extra thick, the density is increased as a result.
by burgerva October 14, 2014
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