Derived from the
Soul Caliber character "Astaroth" an asstooth is a
big, bumbling, klutzy galoomph of a person who is obviously doing something that requires negative use of the
brain.
"No, it's probably NOT a good idea to stick your hand in the waffle iron, asstooth"
"
whatever ,asstooth" - usually said in exasperation when someone keeps
talking about the
new plumbing they're installing in their bathroom.