The Collaborative International Dictionary of English v.0.48:

Tipper \Tip"per\, n.
   A kind of ale brewed with brackish water obtained from a
   particular well; -- so called from the first brewer of it,
   one Thomas Tipper. [Eng.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

tipper
    n 1: a person who leaves a tip; "a generous tipper"
    2: truck whose contents can be emptied without handling; the
       front end of the platform can be pneumatically raised so that
       the load is discharged by gravity [syn: dump truck,
       dumper, tipper truck, tipper lorry, tip truck,
       tipper]