First spliff/joint/Marijuana cigarette of the day. A double meaning - As grafter refering to the fact that to a heavy marijuana smoker, the first joint of the day is the only one that really works. As well as meaning after smoking the afformentioned first joint, between the smoker and the joint, the joint is the only thing thats going to work!
Man A "Come on Dave you lazy sod come and give us a hand". Dave "I cant the grafter got the better of me".