What is no bueno?

"No bueno" is a Spanish phrase that translates to "not good" in English. It is commonly used in informal settings, often among English speakers, to express disapproval, disappointment, or that something is undesirable or bad. It's important to note that "no bueno" is not grammatically correct in proper Spanish. The correct phrase would be "no es bueno" or simply "malo" for describing something bad. Despite this, "no bueno" has been widely adopted in casual conversation, particularly in regions with significant cultural exchange between English and Spanish speakers.