Feeding in League of Legends is probably a term every player dreads, as the match quickly becomes one-sided when you realize the opponents can always rely on their heavily fed player to give them a significant advantage in teamfights.
Being a jungler in low Elo, my biggest nightmare is to land in a League game where I find teammates who unintentionally feed enemy champions, spam ping my location to get my help, and shove the enemy in their lanes. But the gank usually just donates more kills to the enemy champion because they’re untouchable.