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1.
The Wharf Rats are a sub-group of Deadheads who are drug and alcohol free. Predominantly recovering alcoholics and or drug abusers. From the Jerry Garcia/Robert Hunter song "Wharf Rat" about a down and out wino hanging around the docks of San Francisco.
You can find the Wharf Rats congregating where the yellow balloons are during intermission.
by Woody Thomas January 07, 2006
 
2.
1) One who hangs around by the docks and/or helps with shipping via boats.

2) A song by the Grateful Dead
I went to South Port and saw a Wharf Rat.
by PeoplesMind October 12, 2003
 
3.
A humongous fat woman.
Look at the wharf rat! I bet her pussy lips look like two swollen hams.
by ShamanStevo January 15, 2009