Group of young english lads intent on having a good time, leaving the norm behind them. Usualy "on a jolly" to a seaside town such as Brighton or Margate, London also a popular destination.
(Stems from the episode of only fools and horse 'Jolly boys outing')
"Leave it out i aint gunna say a word to linda 'bout us bunch of jolly boys goin down paignton for that right old royal bender, you got the pills? good, then lets go fucking mental. LETS GO FUCKING MENTAL, LETS GO FUCKING MENTAL, NAH NAH NAH NAH HUH, NAH NAH NAH NAH HUH"