This is the 4357th most frequent Spanish word.
sosa
"Sosa" in Spanish means "dull," "bland," or "boring."
The word 'sosa' here is used to describe the bland taste of the food, indicating it lacks seasoning.
La comida está sosa porque le falta sal.
The food is bland because it lacks salt.
In this sentence, 'soso' is used to characterize the TV show as uninteresting or lacking engaging qualities.
Ese programa de televisión es muy soso y aburrido.
That TV show is very dull and boring.
The word 'sosa' here refers to 'soda' (sodium hydroxide), commonly used as a cleaning agent.