imessage means A message sent via the instant messaging service iMessage. Lexicurio rates it Rare gem — a strength score of 75 out of 100.
Etymology
From the trade name iMessage, from i- + message.
noun
- A message sent via the instant messaging service iMessage.“Fourteen iMessages, six WhatsApps, and two missed calls. She frowned, confused by the list of names appearing. She wasn't that popular.”