A slur typically used against gingers. it originated from an unknown person on Quora saying that ginger
hair is just a greasy version of blonde
hair. The term
pony in it was originally in there to mention longer haired gingers such as Dave Mustaine but has since turned into a generalised slur towards all gingers
Person 1: I love Megadeth but I understand why
Metallica kicked him from when he was with them
Person 2: Exactly! You should never trust a
Grease Pony!