* Typo: Perhaps it was meant to be "SMILE," which stands for "Smiling."
* Misspelling: There may be a misspelling of a real acronym.
* Inside Joke: It could be a unique term within a specific group or community.
To help me understand, could you provide more context? For example:
* Where did you see this acronym?
* What was the context of the message?
* Who was using the term?
With more information, I can better understand what "SMHILY" might mean.