a person or thing that slings.
Machinery. flinger(def 2).

Origin of slinger

Middle English word dating back to 1350–1400; see origin at sling1, -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for slinger

Historical Examples of slinger

Word Origin and History for slinger

"soldier armed with a sling, late 14c., agent noun from sling (v.).

Online Etymology Dictionary, © 2010 Douglas Harper