| a fool or simpleton; ninny. |
| a stew of meat, vegetables, potatoes, etc. |
"That wilfull and vnruly age, which lacketh rypenes and discretion, and (as wee saye) hath not sowed all theyr wyeld Oates." [Thomas Newton, "Lemnie's Touchstone of complexions," 1576]Hence, to feel (one's) oats "be lively," 1831, originally Amer.Eng.