cuppa

A cup of tea (when used without another kind of drink). A colloquial contraction of "cup of." Primarily heard in UK. How are you, Barney? Care for a cuppa? Why don't you ask John round later for a cuppa? Fancy a cuppa? I just put the teakettle on.

cuppa joe

A cup of coffee (where "cuppa" is a colloquial contraction of "cup of"). Though the true origin is unknown, "joe" as a synonym for coffee is theorized to either be a shortening of "jamoke" (a combination of Java and Mocha, two major suppliers of coffee beans), or as a reference to it being the drink of the ordinary man (i.e., the "average joe"). Primarily heard in US. I can't even function in the morning until I've had my first cuppa joe. If you ask me, this place serves the best cuppa joe in the whole city. The boss still hasn't finished his first cuppa joe, so don't give him the bad news just yet.