Definition of tippers:
(n) :
Someone who tips; someone who gives a gratuity.
(n) :
(UK) A goods vehicle with a tippable body, used for carrying loose materials such as gravel or rubble; a tipper truck, tipper lorry, or dump truck.
(n) :
One who gives private hints about racing or financial speculation, etc.; a tipster.
(n) :
A person who tips or discharges a load, or dumps waste (especially illegally with the latter).
(n) :
(slang) A small moustache.
(n) :
A device for loading goods such as coal by tipping them.