Definition of “sow your wild oats” - English Dictionary. “sow your wild oats” in British English. sow your wild oats. › If a young man sows his wild oats, he has a period of his life when he does a lot of exciting things and has a lot of sexual relationships. (Definition of “sow your wild oats” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) Translations of “sow your wild oats”.