My son is so violent towards me.

I am very shocked at my son's behavior today I was terrified of him for a moment,,,,,it was cute at the same time but so scary I didn't know wether to laugh or cry!! I was trying to do some work and he came with his little baby car and hit me in the foot hard, even though I told him not to do that since he tripped me and I fell over last time,,, I then tried what my husband did when he did it to him before I and pushed his car away and gave him an angry look, so he gave me an even angrier look,,,,with food still in his mouth he got up from his car and started hitting me repeatedly on the stomach since that's all he can reach, and he is strong it was really painful and I was too shocked because we don't do that I don't know where he learnt it from? We don't even watch violent movies around him,,,I told him to stop we don't do this here,,,he didn't even care!!! And earlier I ate some food after I fed him already and he came running towards me and slapped me hard on the mouth meaning I should feed him not me!!!I don't understand when he is around other children his age he is so sweet and kind but around us he shows his worst! His literally two years old but hits like an adult!!