What does tlot mean in somebody riding a horse?

"Tlot" is not a recognized term in the context of horseback riding. It's likely a misspelling or a slang term that's not widely used.

Could you provide more context or information about what you heard or saw? Perhaps you meant a different word entirely, like:

* "Trot": A four-beat gait where the horse's legs move in pairs.

* "Lope": A three-beat gait, often considered a faster and smoother version of the trot.

* "Gallop": A very fast gait with a four-beat rhythm.

Knowing the full phrase or situation would help clarify what you're asking about.