The 'You Ain't No Muslim, Bruv' meme originated from a 2015 mobile phone video recorded during a knife attack at London’s Leytonstone Underground station. As the attacker was being subdued by police, an unidentified bystander famously shouted the phrase, instantly distancing the community from the attacker's extremist actions. The quote went viral as a powerful display of multicultural solidarity and British resilience, even being praised by then-Prime Minister David Cameron. In meme culture, it is frequently used as a reaction to call out hypocrisy, gatekeeping, or anyone whose actions contradict the values of the group they claim to represent.