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1.
A fantastic sport which combines physically demanding cross country skiing and precise marksmanship; the only people capable of participating are extremely cool. Never mess with a biathlete, they have rifles. Real skiers ski uphill, in tight spandex.
Wow! Look at those CRAZY cool people!! They must be competing in a Biathlon.
by Biathlon chick April 28, 2009
 
2.
the act of engaging in vaginal and anal sex at the same time. usually pertaining to a female and involving at least three individuals.

related: biathlete

Sherry was doing a biathlon with Ben and Jerry.
by bo hooo December 12, 2007