The "teh" is Internet meme that was popular in the original Penalty Box, so much so that it was adopted by the mods when they closed down the old joint and opened up the new.

Boxer or Bxer or BoXer are terms for one who spends time in Teh Bx.

Recently there has been a debate as to whether Boxer is appropriately gender-neutral, thus leading to the rise of the more inclusive Boxers and Boxettes.

The origin of this particular Do was in the permanent haze of surrealism and absurdity that is Teh Box, thus it is called Teh BoXer Do.

But since it isn't so much a party as an opportunity to recruit others to our particularly deviant way of life, it was posted to the main board so others could join in.

Please note, all of the above is a lie. BoXer is a ancient mystical formula for the total transformation of humanity and everything that resembles it. If you attend this event your life will never be the same, the sky will never seem quite so blue again, the sun will never give enough warmth. Oh, and in this particular case I really recommend that you DON'T DRINK THE COolaid.