tittie

[tit-ee]

titty

1

or tit·tie

[tit-ee]
noun, plural tit·ties. Scot. Informal.
  1. sister.

Origin of titty

1
1715–25; perhaps orig. form of sister in children's speech
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018