As a noun:
1. A small, sturdy horse.
2. A type of small, fast motorbike.
3. An abbreviation for "right-of-left turn."
4. (slang) A very small amount.
As a verb:
1. To behave boisterously or rebelliously.
2. To roll.
As an adjective:
1. Robust or sturdy.
2. Lively or energetic.
As an exclamation, it can also be used to express frustration or annoyance.