Olympique de Marseille, known as OM, is one of France's most passionately supported football clubs, and Allez l'OM is the standard rallying cry heard in the stands at the Stade Velodrome. Pairing that support with ferme ta gueule, a blunt French way of telling someone to shut up, turns a familiar chant into a direct taunt for rivals, especially Paris Saint-Germain supporters. Short clips like this circulate on soundboards and social video because they capture that derby attitude in seconds, without needing any commentary.