Slim Thiccí Share definition Flag YRF Slim Thiccí is a rapper in the rap gang known as ‘YBR’ or ‘Young Rich Furries’. “Ey it’s YRF Slim Thiccí, and imma gay furry, If ya try and talk me down, imma fuck you in a hurry” Slim Thiccí by Big_gei_69 January 31, 2019 0 0 Get merch Get the Slim Thiccí mug. Buy Now — $32.95 See more merch