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Apparently there's no way to do it. Markdown doesn't support underlining and <u> isn't a supported tag. You can post a request on meta.SE if you really want to be able to underline.
You shouldn't underline text: in the past 10 years this behavior is reserved for hyperlinks.
One more thing you can do is to use backticks: they escape stuff and apply some monospace font which can be changed in the CSS. But it's generally better to stick to a few types of emphasis rather then many :)
And anyway, underlining for emphasis is a relic of the typewriter age and should never be used in modern typography. The sole exception I am aware of is certain kind of legal documents, where underlining is required by law.
If you want underlining to express sarcasm, maybe it would be best for you to simply not underline?
Underlining has always been frowned upon.
@Harry, there are >10 million results for not recommended to underline text that is not a link, see e.g. a general explanation at Underline links that are not otherwise identifiable as links.
@Harry: that's yet another reason never to underline text. If people don't recognise sarcasm when they see it, no amount of underlining is going to help them.
It's customary to use the [sarcasm on] and [sarcasm off] indicators.
(serious but not well-written advice edited out) But Andrew is right: if there is any doubt about the quality of the joke, it's better not post it at all; and underlining isn't going to change this. And on MO, better doubt all jokes.
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