How to Say "hot air" in Spanish
The most common Spanish word for “hot air” is “carreta” — use 'carreta' when referring to someone who talks a lot with meaningless or deceptive words, often to persuade or mislead.
carreta
kah-REH-tahkaˈreta

Examples
Ese vendedor tiene mucha carreta, no creo nada de lo que dice.
That salesman has a lot of hot air, I don't believe anything he says.
Ese vendedor tiene mucha carreta.
That salesman has a lot of hot air (he talks a lot).
¡No me eches carreta!
Don't give me that nonsense / Don't lie to me!
Action Verbs with 'Carreta'
When used as 'chatter,' it is almost always paired with the verb 'echar' (to throw/toss).
Literal Translation
Mistake: “Thinking someone is talking about a physical wagon when they say 'echar carreta'.”
Correction: In Colombia, if someone says they are 'echando carreta', they are just chatting or telling stories.
humo
oo-mohˈumo

Examples
El político prometió mucho, pero solo vende humo.
The politician promised a lot, but he's just selling hot air.
Ese candidato solo vende humo, no tiene planes reales.
That candidate is just selling hot air (making empty promises), he has no real plans.
Desde que lo ascendieron, el humo se le ha subido a la cabeza.
Since he was promoted, the conceit has gone to his head (he has become arrogant).
Figurative Meaning
This meaning uses 'humo' because smoke is insubstantial and disappears quickly, symbolizing something that sounds impressive but has no real value.
Carreta vs. Humo
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