thiceps Share definition Flag A word used to describe an obese persons upper arm area usually known as a bicep or tricep. Especially when it resembles a flabby thigh. Bob has gained a lot of weight! Have you seen the size of his thiceps? They are huge! thiceps by R C-don October 19, 2009 0 0 Get merch Get the thiceps mug. Buy Now — $32.95 See more merch