noun
1.
a. : a wild grass of the genus Avena: as
(1) : a European annual weed ( A. fatua ) that is common in meadows and pastures
(2) : wild red oat
b. : tall oat grass
c. : a plant of the genus Uvularia
2. wild oats plural
a. : offenses and indiscretions ascribed to youthful exuberance
b. : male premarital promiscuity — usually used in the phrase sow one's wild oats