* A misspelling: Perhaps you meant a word like "moment," "momentary," or "momentum."
* A slang term: It could be a slang word or phrase used in a specific community or context.
* A made-up word: It might be a fictional term from a book, movie, or game.
To help me understand what you're looking for, could you please provide more context?
For example:
* Where did you encounter this word? (e.g., a book, a conversation, a website)
* What was the context? (e.g., what was being discussed, what was the tone of the conversation)
* Do you have any other information about the word? (e.g., its origin, its usage)
With more information, I can try to figure out what "momantai" might mean.