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a modern endurance sport, consisting of swimming, cycling and running, in that order.
by Henri August 05, 2003
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May 17 Word of the Day
Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.
I felt deep sonder thinking about the all the people who looked up this word along with me.
by rednos January 10, 2013
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One of the best and most addicting forms of competition consisting of swimming, cycling, and running all at varying degrees of distances. Triathlon is not for the weak, for it puts the athlete in an undescribeable amount of pain, but when the race is over, you want to do it again. Anyone who downplays the difficulty of a triathlon or the classification of it as a sport should be beaten.
I did my first triathlon last summer, and I have since been addicted.
by nirvanarageatm December 12, 2004
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The coolest fricken sport in the whole world and includes swimming, biking, and running.
by Anonymous March 31, 2003
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Any night of sexual activity consisting of the entire trifecta of penetrating sexual acts. The official order consist of oral, vaginal, and finally anal sex. However, if used as "we might as well have pulled a triathlon" it's understood the acts were there, but not the order.

A reverse triathlon would simply be the acts in reverse order.
If I really like the guy I let him run the triathlon on me, but no one is going backwards on me, that's just dirty.
by runner93939 October 09, 2007
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When you enter a pet store, stick a fish, a hamster, and a parakeet up your ass and see which one gets out first.
You know what? That hamster is giving me the stink eye. He’s gonna participate in the annual Triathlon
by Ko4 October 29, 2020
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Sex technique for the men.
You breathe deep (head)
Go ride her. (On top/bike)
The run her. (Bottom/Run)
I ran the triathlon on her last night.
Hoovered, drove, ran it.
by S.Mathews February 03, 2009
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