Describes something literally or figuratively disgusting or unbearable
Encoding Strategies:
linguistic
mnemonic

a pest
a bug or vermin
+
-oso
full of
(adjective suffix)
Apestoso means stinky and sounds like a pest0 with the suffix -oso1 (full of1), since something full of pests would smell bad.
apestoso
stinky, smelly, foul-smelling
When something has a strong, unpleasant smell or reeks badly.
Esos zapatos están apestososThose shoes are stinky
El cubo de basura huele apestosoThe trash can smells foul
disgusting, awful, annoying (colloquial)
Just as something stinky is repulsive to the nose, something that's repulsive is annoying or awful.
Qué comportamiento más apestosoWhat disgusting behavior
Esa película fue apestosa, no la recomiendoThat movie was awful, I don't recommend it