how do you pronounce your last name?

It's pronounced "oorKADD". This is the modern French pronunciation, where the "H" is silent, "ou" makes an "OO" sound, and you don't pronounce the "e" at the end.

what is that you are drinking?

It's called yerba mate. It's a traditional tea from South America. It's popular in Uruguay, Argentina, Paraguay, and southern Brazil. You put the tea in a gourd, pour hot water, and drink the tea through a metal straw that has a filter at the bottom (so you don't get leaves with your drink). No, you can't smoke it (ever seen anyone smoke earl grey?).