Discussion in our house last night, just before we fell asleep:
“He’s…hmmn, I was going to say batshit crazy but that’s not quite right. He’s bugfuck crazy. It’s different. Why is that, do you suppose?”
“It’s the vowel sounds. The uh sounds aggressive, dangerous. But a and i are less serious. It’s like froot bat. Gotta say it with a double o. The oo is all eccentric and bouncy and cheerful. As well as, y’know, mad.”
So there you have it: the nuanced psychology of vowels. Madness is all in the mouth.
And let me tell you, after a day of construction din next door (they are drilling up their driveway), we know all about the edge of madness.
However liberal application of Guinness, a spicy ham, kale, and white bean soup, followed by a luscious pumpkin thingie and ice cream improved my mood considerably…
Nicola Griffith 
Makes me think of Gandalf's “Fool of a Took” Tolkein did have a way with words when he chose.
BTW — howinhell can you stay in shape, eating as well as you do?
Anon, I also at a huge plate of garlic bread. (Yep, now I'm gloating.)
It just seems normal to me to eat as much as I want. I always have. Every now and again I gain a few pounds, every now and again I lose a few.
The last time I lost weight abruptly was in Los Angeles, during the LLF Emerging Voices Retreat–about 5 lbs in a week. Whap. Happily put it all back on by the end of our 10-day jubiless extravanza, though.
Eh, it's just a thing.
The psychological morphology of batshit? And I'm not even sure I ever heard the term bugfuck before. But you are clearly correct. Of course. :) Love it.