Top Definition
In a musical ensemble, when the number of brass instruments increases significantly in a short period of time.

In musical notation, when, after a period of rest, the brass section emerges with gusto.

Brass players are awesome.
The pep band was poor in brass for a long time, but last year there were a ton of awesome trombone-playing freshmen, and it became a brassgasm.
by monikawithak October 22, 2010

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