Coolio's Son -- Slide, Slide, Slippity Sliding ... to Prison

Coolio's Son -- Slide, Slide, Slippity Sliding ... to Prison: Coolio's son is about to go on the exact opposite of a fantastic voyage -- he's headed to prison for at least 3.5 years ... TMZ has learned. As we first reported, 22-year-old Grtis Ivey was arrested on November 14, 2011 for allegedly busting into a…