As a Noun:
1. A short sharp movement with your finger into the shoulder or upper part of the torso of someone. English = prod, jab, poke.
As a Verb or Adjective:
1. To make quick pushing movements with your finger into the shoulder or upper part of the torso of someone, to get their attention or to aggressively make a point. You use this sign to mean the person who does it is rude and impolite.
2. English = poke, prod, jab (in the shoulder).
3. To keep on telling someone the same thing repeatedly in an aggressive or authoritative way which is rude and unpleasant.