If someone is bolshie, they get annoyed when people tell them what to do, and they push back. They argue. They stall. They will not just obey. It is not usually about hitting anyone — it is a stubborn, unhelpful mood. You can have a bolshie worker, a bolshie teenager, or just a bolshie afternoon. The word is British and informal; older speakers use it more than young ones. Though actually, it started as a nickname from Bolshevik, the Russian revolutionary party. In ordinary talk now it does not mean “this person is a communist.” It has gone softer: “this person will not do as they are told.” People also stretch it a little — a bolshie email, a bolshie look — still the same idea of rude push-back.