billy-kasas Share definition Flag Boring ass 90 year old Greek Mathematician whose actual name isn't even billy. Person 1 : which teacher do we have tomorrow morning? Person 2 : Billy-Kasas Person 1: fml billy-kasas by Mpomporis72 December 5, 2019 0 0 Get merch Get the billy-kasas mug. Buy Now — $32.95 See more merch