An abbreviation of "damn it," but also can be used in the place of nouns and adjectives in the presence of close friends, making it go well beyond a standard, conventional definition. Can be used to describe something impressive, surprising, or pleasing. Can also be used to describe or refer to a social event, group of friends, etc. It can actually be used to replace every noun or adjective in your vocabulary if you are amongst a group who will understand it (similar to the Marklars on "South Park.") It knows no bounds.
Can also be spelled "damnie" or "dammie."
To refer to a social event (n.): "Are we doing the dammy tonight?"
To describe a social event (adj.): "It's going to be pretty dammy."
At a bar: "I'm going to have one more dammy then close my tab."
To greet friends (n.): "Hey dammies!"
To express surprise or pleasure (adj.): "Well, dammy!" or "That was pretty dammy."
To talk about an event or occurrence(n. or adj.): "Did you see that dammy on TV last night?" or "My trip to Europe was really dammy."
These are but a few examples.
NOTE: The use of the term, "double dammy," should be used sparingly. There are few things that constitute a true "double dammy," so use your discretion before saying it.