Used in several countries of Latin
America (previously thought to have originated in Buenos Aires). Also spelled chamullo and the verb infinitive can be chamullar or chamuyar. Among the various shades of meaning, it commonly signifies speaking on a subject with a pretense of authority, when in reality the speaker is simply inventing, or "bullshitting." It can also mean "sweet talk" such as when a guy is "talking
trash" to a girl, saying nothing of substance, for the purpose of socializing. Although these uses are largely Spanish and Pocho
slang, "chamuyo" appears to be making inroads into English
slang.