Skunks are most commonly known to emit a terrible odour. Tasmanian devils also emit a pungent odour when disturbed.
The skunk, when alarmed, will produce a terrible odor!
A skunk is one possibility.
The dogs odor was terrible.
The toilet (WC) has a terrible odor.
emit means to give off, to expel, to send out, or discharge; as of light, heat, or radiation, vapor, etc.; "The ozone layer blocks some harmful rays which the sun emits" Or "sour milk emits a bad odor".
Skunks.
skunk
You probably don't drink enough water, or you have a blatter infection.
skunk
He's either very dirty or sick. Caked on feces smell terrible.
pheromone
HELL YEAH!