On a long haired dog, cat, or sometimes, an unwashed co-worker, a combination of a loose bowel movement stuck in the hair around the butt. This mass has been sat upon, flattening it to a
waffle-like appearance. In a co-worker, the presence of a butt
waffle is indicated by a strong smell of "old
shit".
"Hold still, you fucking
cocksucker. If we don't get this butt
waffle off yer ass, you'll have to
stay outside for a week." (Generally screamed at a dog or cat, Not a co-worker.)