It's funny. Tell someone to smoke your balls, and you'll realize how GREAT it is.
After you say it enough, and become popular. You can also say "Smoke em" or "Kid, smoke em, now". People will know what you mean.
"Zach, you're being a douche bag, smoke my balls."
Other person: "Hey, I like paintings and straw hats."
You: "Kid, smoke em, now."