The word "ibet" is a slang term that is a contraction of "I bet." It is commonly used as a response to express agreement, acknowledgment, or sarcastic skepticism, similar to saying "Mmm-hmm. If you say so."
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Sarcastic "Yeah, right!". Explanations are generated by AI and may be inaccurate.