From The Collaborative International Dictionary of English v.0.44 [gcide]:
jockey shorts \jock"ey shorts'\ (j[o^]k"[=e] sh[^o]rts), noun pl. [from a Tradename.] A type of men's underpants without legs, fitting tightly and held by an elastic waistband; also called {briefs}. Originally a tradename, the term has become common for that type of underpants. [PJC]
From WordNet (r) 2.0 [wn]:
noun
1: short tight-fitting underpants (trade name Jockey) [syn: {Jockey shorts}]
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