jamboree

1. (dated, slang) A frolic or spree.Examples: "[']Chuck us down that net on top of the lockers, Stalky.' / 'That's all right. It's a collapsible jamboree, too. Beastly luxurious dogs these fags are. Built like a fishin'-rod.[']"; "1899m W. A. Fraser, "Raja Singh and Other Elephants" in McClure's Magazinehttps://www.google.com/books/edition/McClure_s_Magazine/8C9NAQAAMAAJ?hl=es&gbpv=1&dq=%22A+Calcutta-made+pony+cart+had+been+standing%22&pg=PA42&printsec=frontcover A Calcutta-made pony cart had been standing in front of the manager's bungalow when Raja Singh started on his jamboree."datedslang

2. (scouting) A large rally of Scouts or Guides.Examples: "The campfires provide enough plain old regular visible light to show this sorry affair for what it is: a bunch of demented Boy Scouts, a jamboree without merit badges or hygiene."; "According to recent revelations, much of the jamboree’s 117.1bn won (£700,000) budget was spent on the operation of the organising committee, which seems to have included many lavish trips abroad, sometimes to countries such as Switzerland and Italy that have never hosted jamborees."

3. (card games) In euchre: an undefeatable hand containing the five highest cards.