"aggressive diffuser" refers to someone who spreads ideas or information forcefully and without considering other people's perspectives. They might try to dominate conversations and push their beliefs onto others. Full definition
Around the rear, a more aggressive diffuser is present, long with large oval exhaust outlets. (automobilemag.com)
It now comes with a new twin louver grille that's better at directing airflow, and in back buyers will see a more aggressive diffuser. (autoweek.com)
Bulging wheelarches hide front and rear tracks that have been widened by 60 mm and 4 mm respectively, while at the rear is an aggressive diffuser that generates enough downforce to negate the need for a Civic - style spoiler. (evo.co.uk)