Wild, boisterous, or slightly crazy?

"Shandygaff is a very refreshing drink, being a mixture of bitter ale or beer and ginger-beer, commonly drunk by the lower classes in England, and by strolling tinkers, low church parsons, newspaper men, journalists, and prizefighters." As early as the 17th century, shandy was also being used in dialectal English as an adjective to refer to people who were wild, boisterous, or slightly crazy. Perhaps, the "place of lower-class amusement" sense of gaff and this sense of shandy were blended together. It's certainly not unreasonable to think that people drinking shandygaffs in lower-class establishments got a little wild. . . .

An Undiluted History Of 'Shandy' | Merriam-Webster