Rolt has several meanings:
As a noun: a small sturdy horse, a type of small fast motorbike, an abbreviation for “right-of-left turn,” or slang for a very small amount.
As a verb: to behave boisterously or rebelliously, or to roll.
As an adjective: robust or sturdy, or lively and energetic.
As an exclamation, it can express frustration or annoyance.