Blue mud

Posted by ESC September 08, 2004In reply to Full of posted by Melanie Klem on September 07, 2004

My grandmother used to say "You're full of blue mud"..to indicate that we were full of crap. How does blue mud relate to crap and what the heck IS blue mud? Any origins of this phrase?

I haven't found anything yet. I found "blue mud-dabber" but that refers (I guess) to the color of the insect.