Learn what "i bet you're not even wearing underwear" means, when people say it, and how to use it naturally in English.

This is a rude, sexual tease that suggests someone may be naked under their clothes.
From The Marriage Contract, Episode 8
He makes a sexual joke while teasing the other person in a provocative conversation.
Use only in very informal or flirtatious contexts, and even then it can sound crude. It would be inappropriate at work or with someone who could feel harassed.
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