The Breastival is the never-ending show of awesome titties and juggies and breasties all over the world.
More and younger girls join the Breastival every day, and it is a GOOD thing.
Any recreational or public event or location which possesses a high likelihood of featuring multiple young women prominently displaying their chests.
Often used as an outdoor version of breastivities
Guy 1: Dude, you going to the class picnic this summer?
Guy 2: Dunno...is it worth it?
Guy 1: Are you kidding? Last year the thing was a total breastival!
College Guy: Hey, it's sunny - let's get out of the dorms and walk around the quad, it's sure to be one heck of a breastival out there today.