English question

My colleague has a calender in his room and everyday there is a new thing to learn about English as a language on.

Today's hint is:

Kaspar was really worried about the joint his elderly neighbour had invited him to on Sunday. Might he have misunderstood something?

The calender explains that: no, that old Lady does not want to smoke some pot with him but she's going to make him a nice piece of meat to eat.

Question is, does anybody talk like that? Do you invite someone over to a joint in a non-drug-y way?

Thanks for the help.