A culturally significant holiday for persons of Mexican heritage celebrated yearly on May 4th. Traditional festivities include wearing a sombrero, buying Cinco de Mayo decorations, and camping-out at Taco Bell.
Mat: Hey, you want to go camp-out for Cinco de Mayo Eve at Taco Bell?
Kat: Why?
Mat: So we can get the first tacos on Cinco de Mayo at Taco Bell! Its a cultural obligation.