GNA
GNA definition by Slang.net - The Slang Dictionary
This page explains what the acronym "GNA" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When signing off from online chat, GNA is a quick way to say "goodnight all." Specifically, people use GNA when signing off from a group chat, to say goodnight to everyone in the chat.
If someone just dropped GNA in your group chat, you can use HAGN to wish them a goodnight as well. Or, you can reply with the more-standard gnight or gnite.