1. People who jeer, heckle, or shout disapproval at a speaker, performer, or team, especially at a sporting event.
Usage: Chiefly Australian and New Zealand English; Plural form of barracker
2. Enthusiastic supporters or fans, especially of a sports team.
Usage: Chiefly Australian English; Plural form of barracker

Examples

• The barrackers in the crowd booed loudly when the referee made the controversial call.
• Australian barrackers are known for their passionate support of their local rugby league teams.
• The politician faced a group of barrackers who interrupted his speech with shouts and jeers.
• Barrackers at the cricket match cheered every boundary hit by their team.
• Despite the barrackers' attempts to distract him, the player remained focused on his performance.