Volt said:
In Ireland, Smack = Heroin and Crack = fun ( spelled Craic - pronounce Crack)
Having the craic means having a good time or having fun.
A few years ago we were in NY for a break, and we were in a sports bar and a baseball game was on, there was an argument between the New yorker that we were with and another man. The other man left and told the doorman that we were talking smack to him, The doorman came over to us and said to stop talking smack. I stood up a told the doorman that we don’t take smack and that we were only having the craic, We were thrown out of the bar and the doorman called the NYPD. When the cops came, I told them that we were only having a bit of craic, So they searched us all outside the bar. True story