The Collaborative International Dictionary of English v.0.48:

Slinger \Sling"er\, n.
   One who slings, or uses a sling.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slinger
    n 1: a person who uses a sling to throw something

U.S. Gazetteer Places (2000):

Slinger, WI -- U.S. village in Wisconsin
   Population (2000):    3901
   Housing Units (2000): 1607
   Land area (2000):     3.726444 sq. miles (9.651446 sq. km)
   Water area (2000):    0.022186 sq. miles (0.057461 sq. km)
   Total area (2000):    3.748630 sq. miles (9.708907 sq. km)
   FIPS code:            74400
   Located within:       Wisconsin (WI), FIPS 55
   Location:             43.328466 N, 88.283461 W
   ZIP Codes (1990):     53086
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Slinger, WI
    Slinger