Retromingent 

Urinating backwards. Also an animal such as a raccoon that urinates backwards. From the Latin retro- (back) + mingent from mingere (to urinate).

"You have revealed yourself as a miserable, carping, retromingent vigilante, and I for one am sick of wasting my time communicating with you" (Benjamin C. Bradlee, Editor, The Washington Post).

Retromingent by creedmoor December 28, 2005

Retromingent 

Outdated zoological term which refers to animals which piss backwards. Like a cow. This word is also an excellent insult for fat women who like to piss while kneeling down.

'I hate bumming retromingents while they're pissing'
or
'She looks positively retromingent'

Retromingent by Harry Cockburn November 1, 2005