carbuncle

Carbuncle references a random text box seen in Game Grumps episode number two of Sonic Shuffle saying “The Carbuncle ate itself.” This notification was completely unrelated to what was happening in the game and only interrupted the conversation Danny and Arin were having. The phrase has since become a running joke and reference within the fanbase.

Therefore, a “carbuncle” is a person who interrupts or contributes nothing of value, interest, or importance to a conversation.

“Kristen, could you quit being a carbuncle?”

“Jax is such a carbuncle.”