Heek: noun, odor or smell that is so offensive that you cannot even dignify it with the terms "odor" or "smell." Way worse than stank or funk. Heek clears a room fast, and requires chemical intervention to remove it.
To heek: to emit foul evil odor
My dog rolled in a dead sea lion carcass. He heeks! I had to wash his funky ass three times before I would let him back in the house.