Where "Bash" Comes From
In this sense — a lively party — "bash" is part of a loose family of Australian party words alongside knees-up and shindig, all near-synonyms with no sharp distinction between them. Green's Dictionary of Slang traces the party sense back to 1948; "bash" meaning "a hit or blow" is much older, and the party sense likely grew out of the same rowdy, boisterous energy.
"Birthday bash" is probably the most common everyday use — any celebration with a bit of noise and energy to it qualifies.
Source:
"They're throwing a big bash for the engagement."
How Aussies Actually Use It
It's used for anything from a backyard barbecue to a full-blown wedding reception.
"Christmas bash" and "office bash" are common seasonal uses.
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