feel one's oats
feel one's oats {v. phr.}, {slang}
1. To feel frisky or playful; be eager and excited.
The horses were feeling their oats.
When they first got to camp, the boys were feeling their oats.
2. To act in a proud or important way.
The new gardener was feeling his oats and started to boss the other men.
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Source: A Dictionary of American Idioms
