FBChallenge

FBChallenge represents a coach's challenge in American football. The image centers the red challenge flag used to request an instant-replay review. Under NFL rules, a head coach starts an eligible challenge by throwing that red flag before the next legal snap or kick.

It belongs to Twitch's wider FB football set alongside FBPass, FBCatch, FBBlock, FBRun, FBPenalty, FBSpiral, and FBtouchdown. That makes FBChallenge the review-and-officiating reaction in a set otherwise built from the actions and outcomes of a football play.

Viewers type FBChallenge in Twitch chat for disputed calls, replay reviews, moments when viewers think a ruling should be checked, or joking challenges when something on stream looks questionable.