Pissweed

Pissweed is a potential side effect of wave bombs. Should the Koeller's Gravy be in a particularly nasty or playful mood at detonation, it may mutate some plants (including asparagus) into a weed that grows extremely fast, spreads sticky seeds across great distances in only weeks, and oozes bilirubin and uric acid, causing it to smell similar to urine.
Despite this nasty odor and depending on the plant from which it mutated, Pissweed is actually edible when wiped clean of its gelatinous excretions.