To take a quick shower from the waist down to remove any remnants (odor, residue) of a hook up that lingre on ones cock; so the next girl to fuck or suck is unaware you just taxed the shit out of some ass immediately prior to meeting up with her
Andy: That was quick, you showered and your hair isnt even wet?
Me: I just took a Waist Down Shower so your mom doesnt smell your sisters pussy on my cock!
Andy: *Bummed*
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