
BESCUMBER (v)
Definition: To spray with poo.
Analysis: Actually bescumber is just one of many words in the English language that basically mean “to spray with poo”. These are: BEDUNG, BERAY, IMMERD, SHARNY, and the good ol’ SHITTEN. In special cases, you can use BEMUTE (specifically means to drop poo on someone from great height), SHARD-BORN (born in dung), and FIMICOLOUS (living and growing on crap).
Alternative: If that is too vulgar, you can use BEVOMIT and BEPISS, which meanings should be obvious to you, as well as BESPAWL (to spit on).
Oh, and if you want to say poo without looking like you're saying it, you can use ORDURE, DEJECTION, and EXCRETA. To mean something more specific, you can use MECONIUM (first feces of a newborn child), MELAENA or MELENA (the abnormally tarry feces containing blood from gastrointestinal bleeding), LIENTERY (diarrhea with undigested or partially digested food), and STEATORRHEA (fatty stool that's hard to flush down).