Here are some examples of how "on" can be used in cowboy slang:
* "He's got his work cut out for him, on." - Emphasis on the difficulty of the task.
* "That horse is strong, on." - Emphasizing the horse's strength.
* "I'm on the trail, on." - Means "I'm definitely on the trail".
* "Come on, let's go." - An urging to move forward.
* "That's on you, pardner." - Means "You're responsible for that".
The exact meaning of "on" can vary depending on the context.
It's important to note that cowboy slang isn't a uniform language. Different regions and individuals may have their own unique expressions and variations.
Do you have a specific example in mind? If you can provide the full phrase or sentence, I can help you understand its meaning more accurately.