smhia

Chat abbreviation. "Shaking my head in agony."

This sort of thing is reserved for when you read or hear about something so incredibly stupid or dangerous, either texted, posted, or chatted, that it physically hurts your head to comprehend. You want to tell them NO or STOP but you know it won't do any good - so this is the best you can tell them.

"And now to break my previous record for the most amount of bubble wrap eaten within 60-seconds !"
SMHIA ...