blurt
Blurt is a verb meaning to say something suddenly and without careful consideration, especially a thought or secret that one would prefer to keep private. The act is typically impulsive and may be perceived as rude, careless, or embarrassing. The common construction is blurt out, as in "She blurted out the name."
Usage notes: Blurt is transitive when combined with the object being spoken, e.g., "blurt out the answer"
Etymology: The precise origin is unclear, but the word has been used in English for several centuries
See also: Spill the beans; indiscretion; bluntness; imprudence.