Not necessary, not required, not wanted.
Stand up comediant: "LOOK! THERE'S A NIGGA!"
Guy in the crowd: "That was uncalled for!"
Inapproriate, unsuitable, or just plain wrong for a situation.
*All blacks when AGAIN! Team and crowd cheers*
Team member A: Fucking awesome!
*Team member B slaps team member A on ass*
Team member A: That was just uncalled for mate.