It is an old word used to discribe the texture of a substance used in group or individual smoking. But, popo isn't bad because it's just an adjective of the real substance used for the ritual rather than being the substance.
The pipe is yours to set the popo on fire so it will smoke. Draw the smoke from the popo into yuorself. You will feel changed and must return to yourself. Popo is just a texture of something. That is Gooey! like lava...
Little is known about the popo other than it is a heavenly creature of unearthly origin who is virtually unbeatable at most competitive pursuits... excelling particularly at backgammon, yoshi, dr mario and fill-it-ins. Additionally, Popo is always spelt as Popo(4) not Po po(22).