oats UK /əʊts/US /oʊts/noun 3phrases 1 noun3 •A mass of oat plants (genus Avena, especially Avena sativa).Oats are in the north corner of the farm.Usually oats is last in a rotation and does not get the fertilizer that other feed grains get. •Seeds of an oat plant, especially prepared as food.Oats is a heart-healthy breakfast food.Oats are good for you. •(slang) Sexual intercourse, sexual satisfaction; semen.Now you been foolin’ with your oats, you been messin’ with your hay, you say, “If you take me back, baby, I’ll do it the other way.” — 1975 Phrases with oats sow one's wild oatsTo engage in premarital or extramarital flings.