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1.
a close friend with whom one hikes or generally hangs out with outdoors.

a euphemistic term denoting a same sex (often male) friendship whose level of time and emotional commitment may raise eyebrows among the less open-minded / their jealous wives.
my hiking partner and i are planning on hiking the white mountains this summer.

i hear jeb's taking some flack from his wife over the amount of time spent with his 'hiking buddy'.
by dagger_grrl October 02, 2004