* A literal attack involving tacks: This might refer to someone throwing tacks on the ground to harm people or animals.
* A metaphorical attack: This could refer to someone using "sharp" or "pointed" words to hurt someone's feelings.
* A playful challenge: This might be a game or a playful competition where players try to find the most creative or humorous answers to a word puzzle or riddle.
To give you a more specific answer, I need more context. Can you tell me more about the situation where you heard "tack attack"?