From The Collaborative International Dictionary of English v.0.48:
Hump \Hump\ (h[u^]mp), n. [Cf. D. homp a lump, LG. hump heap,
hill, stump, possibly akin to E. heap. Cf. Hunch.]
1. A protuberance; especially, the protuberance formed by a
crooked back.
[1913 Webster]
2. (Zool.) A fleshy protuberance on the back of an animal, as
a camel or whale.
[1913 Webster]
3. (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.
[PJC]
From The Collaborative International Dictionary of English v.0.48:
Hump \Hump\, v. t.
1. To form into a hump; to make hump-shaped; to hunch; --
often with up.
The cattle were very uncomfortable, standing humped
up in the bushes. --T. Roosvelt.
[Webster 1913 Suppl.]
2. To put or carry on the (humped) back; to shoulder; hence,
to carry, in general. [Slang, Australia]
Having collected a sufficient quantity, we humped it
out of the bush. --C. L. Money.
[Webster 1913 Suppl.]
3. To bend or gather together for strenuous effort, as in
running; to do or effect by such effort; to exert; --
usually reflexively or with it; as, you must hump
yourself. [Slang, U. S.]
A half dozen other negroes, some limping and all
scared, were humping it across a meadow. --McClure's
Mag.
[Webster 1913 Suppl.]
4. (Railroad) to sort freight cars by means of a hump.
[PJC]
5. to engage in sexual intercourse with. [Vulgar Slang, U.
S.]
[PJC]