Dictionary.com
definitions

tippee

[ti-pee]
noun
  1. a person who receives a tip, as of money or information.

Origin of tippee

First recorded in 1895–1900; tipp(er) + -ee
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tippee

tippee

noun
  1. a person who receives a tip, esp regarding share prices
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012