As in all Poker-related games, you have to collect a poker combination, higher than your opponent.
Cards sequence is moving between two rows of fangs. When you click on the "Clap" button, these fangs clap and slice cards to 2 parts:
upper fangs move down cards to your hand, and lower fangs move up other cards to opponents hand.
After such slicing you have 5 cards. If your combination is higher than opponents, you go level up, and girls show more and more.
Click on "Clap" button, when the best cards combination coincides with your (upper) fangs.