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1.
small and weak
by Anonymous October 22, 2002
 
2.
Feeble, weak. Also applied to objects or places.
The furnishings were a little wimpy for such bold decor.
by VAKI5 May 07, 2005
 
3.
Another name for a "sloppy-joe", commonly used in Pennsylvania.
I need some more chips to go with my wimpy.
These wimpies need more ketchup.
by alandym June 06, 2011