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This word can be used just like "good morning, and goodnight" is used, though it is intended for us nocturnal folk that are always arguing on whether they should say good morning or goodnight after 12am, and before 5am.
as the clock strikes 12am: Goodmornight! Why might you be up at such awkward hours?
by aaronrocket September 19, 2007
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Its a mix of Good morning and Good night, its when your going to sleep in the morning the AM but its dark outside.

Its acronym is: GMN
by Theaoooo November 18, 2015
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