Marc was referring to Jack shouting (cos he never speaks at normal decibels) that Marc was gone now and he (Jack) had won on that particular eviction night . He was crowing like cock of the walk , so Marc was letting him know what a dope he looked for boasting . Great comeback line delivered after the event .
Marc has said to Joel that he knows that he (Marc ) won't win this but advised him (Joel)to continue as he was, not back stabbing and that HE could go all the way . I thought that was a lovely thing to do . Had Marc been more selfish he'd never have offered that very genuine advice to Joel .