a 3-part endorphin boosting activity which involves running, swimming and general merrymaking (see related: libations, burgers, karaoke, dance-offs).
'Dude, I did the Hippie Triathlon yesterday. My endorphins were buzzzzzzzzin'

Person 1: 'Did you hear about the Hippie Triathlon?'
Person 2: That Outdoor Voices event?

Person 1: Yea, it's, like, the chillest way to get your endorphin rush.
by Mcg_McG_McG_McG November 2, 2018
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