phat-ass pants Share definition Flag Puffy pants worn by wiggas. They achieve ownership of them by asking their successful, wealthy parents for them. I slapped on my phat-hat and my phat-ass pants and went ridin' with some girlies, fo' sho', nigga. phat-ass pants by Bastardized Bottomburp May 3, 2003 0 0 Get merch Get the phat-ass pants mug. Buy Now — $32.95 See more merch