Sixthgraders arm Share definition Flag A penis that is so large it resembles the arm of a sixth grader. Oh my god you guys, I am so sore from last night! Chris totally has a sixthgraders arm. Sixthgraders arm by Sparklepony Wonderhorse December 30, 2006 0 0 Get merch Get the Sixthgraders arm mug. Buy Now — $32.95 See more merch
