A biological approach

"Scrunched down in the seats

of my frozen car,

I told you with smoking breath

how I wanted to piss on the windshield,

both relieving myself

and clearing visibility

in  one masterful stroke.

...And there while the engine warmed

and your your head bobbed

in and out of your coat,

we made some sense of winter.''

-- From ''Winter,''  by D.W. Donzella