Gobsmacked is a good word too.

(Lost for words.)

Here are a few others that can be fun in some circumstances:

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Hircismus: And the Definition: Offensive armpit odor.

In the final analysis: Hircismus comes from the root word "hircus" which means goat in Latin. Someone must have thought smelly pits smelled like goats. Actually, this word combines two sources of great insult potential: smelly and armpits. Why this is not used more often in the discourse of hateful communication is beyond me.

Alternative: Well, armpit is an untapped goldmine for insults. Here are some examples of words you can use: MASCHALEPHIDROSIS or MASCHALYPERIDROSIS (excessive sweating of the armpits). MASCHALOPHILOUS (sexual attraction to the underarms) and AXILLISM (the use of armpit for sex).

Smelling like goats is also a good source of insults (especially since goat is also a slang for a lecherous man). Try CAPRYLIC and HIRCINE (smelling like a pungent goat), and CAPRIC (resembling a goat).

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Bescumber: Here's the 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).

Here are some words along the same line that may one day prove to be useful for you: TURDIFY (turn into turd), COPROPHAGIA (eating of feces [wiki]), and COPROPHILIA (Think 2 Girls 1 Cup [wiki - don't worry, SWF], if you don't know what this is, I shan't corrupt you any further).

Let's this entry with two amazing words: COPREMESIS and MISERERE, both of which mean fecal vomiting. Yes, fecal vomiting. It's a medical emergency caused by the obstruction of the bowel. Perhaps it is a little misleading to say vomiting feces, though I imagine it could get that extreme if one didn't die from the problem first. Usually it is just the odor, but hey, that's pretty bad on its own, right?

I’m all about the shenanigans and malarkey with my Irish self. ??