* Misspelling or mispronunciation: It could be a variation of "stallion spelled," which would mean a stallion that has been castrated. This is often done to make them calmer and easier to handle.
* Regional slang: There might be a specific region where this phrase has a unique meaning.
* Figurative language: It could be used metaphorically to describe a man who is strong and powerful, similar to a stallion.
To clarify the meaning, please provide more context. For example:
* Where did you hear this phrase?
* What was the situation in which it was used?
* Who said it?
With more information, I can help you understand the intended meaning.