PooBoo Share definition Flag The red marks on your leg/legs you get from resting your elbow/elbows on them. Most noticeable after taking a dump. Awe man! I spent so much time in the bathroom I got a PooBoo on each leg. PooBoo by Thor Nedles November 5, 2016 0 0 Get merch Get the PooBoo mug. Buy Now — $32.95 See more merch