jamboree /ˌdʒæm.bəˈɹiː/noun 4verb 1forms 3 noun4 •A boisterous or lavish celebration or party. •(slang, old-fashioned) A frolic or spree.[']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.['] — 1898 •A large rally of Scouts or Guides.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. — 1992 •In euchre: an undefeatable hand containing the five highest cards. verb1 •To take part in a jamboree. formsjamboreed · jamboreeing · jamborees