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1.
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).
by Creedmoor November 22, 2005
 
2.
Outdated zoological term which refers to animals which piss backwards.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'
by Harry Cockburn October 31, 2005