'喊口号' literally means 'to shout slogans' — it combines 喊 (to shout or call out), 口 (mouth, indicating oral expression), and 号 (short for 口号, meaning 'slogan' or 'rallying cry'). Together, the phrase describes the collective, rhythmic chanting of short, memorable phrases, often in unison during group activities.

This action is commonly associated with political rallies, sports events, school assemblies, or social movements. It conveys unity, enthusiasm, or shared purpose — not just speaking, but performing language with vocal energy and group coordination. While historically prominent in formal or ideological settings, it’s also used playfully among friends or students to boost morale. The verb is transitive and typically followed by a specific slogan (e.g., 喊口号‘团结就是力量’) or used intransitively when the slogan is implied by context.