Niggardly tip
A poor tip; the act of giving a niggardly tip is to give a minimal, poor, low tip. Not related to the word "nigger" or black people in any way shape or form.
Server: Ugh, those black people just left me a 5% tip...
Manager: Wow, why do black people have to give such niggardly tip(s)?
Manager: Wow, why do black people have to give such niggardly tip(s)?