Machuchu Party

Noun. When a group of kids put their underpants on their heads and run around yelling.

Less commonly, when a group of men who've been drinking do the same thing.

On 30 January a bunch of guys checked in beers while wearing their undies on their heads. They claimed it was a Machuchu Party.

Machuchu party

A party where a females underwear is worn on ones head for the sole purpose of drinking beer through them.

He wore frilly silk knickers on his head for the Machuchu party.