Yeah is an informal term used as an affirmative response or to indicate agreement. In the context of the clue "Cry with a fist pump," it refers to a triumphant or enthusiastic exclamation often accompanied by a physical gesture of pumping one's fist.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: "That's right". Explanations are generated by AI and may be inaccurate.