"Punch" is a drink.

The word 'punch" has several meanings. It means to hit someone with a closed fist; it means to place a circular hole in an item. It also means a liquid consisting of fruit juices. In the phrase "get some punch" the punch refers to the mixture of fruit juices. Punch is served in a punch bowl and those who wish to have some will "get some punch." Example: Maya, you should get some punch. It tastes delicious. (I hope this helps!) :-)

Punch is a kind of non-alcoholic (usually) drink served at parties or business gatherings. "Get some punch" means to go get yourself some punch to drink. Depending on context, it could be a way to change the subject and deflect a current line of inquiry.