Top Definition
AKA Captain Malcolm "Mal" Reynolds of the vessel Serenity. Known for being particularly dour, with a harsh sense of humour. Although he finds it difficult to open up, it's obvious that he's a good guy beneath it all. Portrayed by Nathan Fillion on the now-cancelled sci-fi show Firefly which lasted just one season on FOX from 2002 to 2003. The nickname was first coined by the character Kaylee in the episode "Shindig".

An affectionate word used by Firefly fans to refer to the character of Mal, and (more rarely) the actor Fillion with reference to the show.
Example 1 -

Mal: Just be careful. We cheated Badger out of good money to buy that frippery, and you're supposed to make me look respectable.

Kaylee: Yes, sir, Captain Tight Pants

Example 2 -

Fan: There was a rumour that Captain Tight Pants himself would turn up at that convention last week!
by Neroli April 21, 2008

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