GCIDE(0.00 / 0 votes)Rate this definition: 1  Hump(n.) (Railroad) a portion of a switchyard with a slanting track in which freight cars may coast without an engine and be sorted through a series of switches. 2  Hump(v. t.) (Railroad) to sort freight cars by means of a hump.
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Imagine an Inflatable Island float fully equipped with water proof MP3 music system with built in MP3 storage box & speakers, drink holders and built in coolers for the best lake party ever! You and your friends & family will enjoy endless summer entertainment on a Sea Doo Inflatable Island lake float or Aqua Lounge.