Gumpy is a slur used against people with Ginger colored hair. It's mainly used against natural Gingers but some might call another person a "Gumpy" for dying their hair a certain shade of ginger.
Ex: I hate Ed Sheeran, get that 'gumpy' off of the stage!
Ex 2: I told you that you shouldn't dye your hair but you did anyways and now you look like a 'gumpy'.
An Insult or Slur used against those with ginger colored hair. It can also be used to insult those who dyed their hair a ginger shade, but its most offensive when it's used against a natural ginger.
Ex 1.: I told you "don't dye your hair red it gon turn out sillier than a goose with a cracker in its beak" but you didn't listen and now you look like a damn gumpy!
Ex 2.: I hate that guy, get that gumpy off of the stage!