To lie, peddle false stories, or try to sell someone a load of crap. It refers to deceiving others with versions of events that are far from reality. (This comes from an old scam where swindlers would sell public mailboxes to gullible people, claiming they would collect the postage fees.)
The news channels were vendiendo buzones all day regarding the corruption scandal.
Fake news or false information. A story or rumor of dubious truthfulness. (Literally meaning rotten fish, it refers to information meant to mislead or deceive).
The newspapers are just publishing a bunch of pescado podrido.
To create a false impression or hype about something. To make people believe that something fake or empty, the smoke, is actually real or valuable (in Argentina, this often refers to someone who talks a big game but has no substance to back it up).
A: That professor would not stop talking and he was acting like a big shot. B: What a way to vender humo!
Bullshit, hot air, or a facade. Refers to something that looks legitimate or impressive but has no substance or is a lie. (In Argentina, it is commonly used in sports and politics to describe people or projects that are all hype and no results).
A person who loves to project a certain image but acts the opposite way. They talk a big game about having strong convictions and morals only to abandon them later. A bullshitter who sells false hope and hot air. (In Argentina, selling smoke or vende humo refers to someone who is all talk and no action).
Trulix told me he was going to go out with his friends, but in the end he was just selling smoke.