To rule (from English), to be the best. Usually the verb is used in its English form for the third person singular (аффтар рулз) but in Russian for plural (падонки рулят). The verb рулить exists in standard Russian and means “to taxi” (e.g. a plane on the runway).
Спарта рулит!
Sparta rules!
(Чатский @ e1.ru, 06/2012)