Suds generally refer to the frothy foam that is created when soap or detergent is mixed with water. It is often associated with the lather created when washing dishes, clothes, or taking a bath. The word "heady" in the clue suggests that suds can be powerful or intense, possibly alluding to strong or concentrated soapy bubbles.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Heady stuff?. Explanations are generated by AI and may be inaccurate.