wild oats

noun[plural only]6

1. •
   Oats of non-cultivated species of Avena, a genus of grasses.
2. •
   (slang, old-fashioned) Sexual intercourse outside of marriage.

   • You had a harem instinct when you were young. You sowed your wild oats. So did you, Mater. — 1916
3. •
   Chasmanthium latifolium, a grass, Indian woodoats
4. •
   Species of Aegilops, goatgrass.
5. •
   Species of Uvularia, the bellworts.
6. •
   (no longer used) A rake.