D defs.my
Entry 2 senses Webster, 1913

Whacker

/wăk'-ẽr/ · Whack·er · IPA /ˈwækə(ɹ)/
01 n. One who whacks.
  1. 1.
    One who whacks.[Colloq.]
  2. 2.
    Anything very large; specif., a great lie; a whopper.[Colloq.]