Maybe for the same reason we call folks like you ****-for-brains.
I suppose you could call that insect a **** beetle, but dung beetle sort of sings, like buffalo chips, cow pattie, and sheep dip. Very mellifluous, like deep doo doo!
In our neck of the woods, it was called bull pucky. However, there were tons of ways for (usually) men to speak colorfully in mixed company. My dad favored a version of "I have to take a Finn d'abuzz" while grabbing a newspaper and heading toward the can.
On my last post here, I got only one thumb up. Well, maybe two. The point is, not many. It hurts me to be overlooked this way. To be discounted.
**** this ****. I am outta here.