Marking something someone is doing, plans to do, or has done as excellent,
neat, impressive, or exciting. Can be applied to people, events, fortune, and
inanimate objects.
David: “I’ve been practicing and have come a long way! I’m
not great yet, but I’m working really hard.”
Rory: “Good for you, man! Cool tag!”
AND
David: “Look, fucker. The donuts are
on sale.”
Rory: “Cool tag. Let’s buy three dozen.”