It can mean many things, to be honest. Could mean 'stroke me more' or 'let me off' or 'I'm bored', or many things so try to look at it in context with what else is happening around the same time.
Is your bunny now an adolescent? If so, spaying/neutering may help, but if this is behavioural and learnt, then you have to break the behaviour, and that depends what is causing is as to how you break it.