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It is a person who is very good at band; who loves to be in the band or loves to play music for the band.
Christian Aguilera = Band Jock
by ABlondeGirlInYourGeometryClass November 14, 2011
(1) The preferred term for ANYONE who is a hard working member of a high school, college or university marching band.

(2) any marching band member who also plays varsity sports for their school.
Wow!! Those Band Jocks are working very hard for their upcoming halftime show!!
by bigg3469 March 21, 2009