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1.
The swag you have after winning a match; makes you seem cooler. Can also be used after losing a match to make you look like less of a failure.
Example 1:

Person 1: Its bad enough they beat us in soccer...now they're breakin' out their post-game swag...

Example 2:

Person 1: Hey we just killed them in that basketball game. Why are they so happy and cool?

Person 2: Oh, it must be post-game swag....
by Narwhals27 October 10, 2010