Possible Interpretations:
* Suggestive Dance: It could be a playful way of describing a dance that involves revealing underwear, perhaps during a striptease or a particularly energetic and suggestive dance.
* Humorous Situation: It might be used to describe a funny or awkward situation where someone's underwear becomes visible or is the focus of attention.
* Specific Dance Move: It could be a slang term for a particular dance move involving underwear, though this is unlikely.
Without context, it's difficult to determine the precise meaning. If you provide more context about where you encountered this phrase, I might be able to offer a more accurate interpretation.