Does "ass" mean something else than what I think it does?
Solution 1:
Well, there is of course the animal but I doubt you bought one of those.
But I think the period after the ass. on your receipt is a clue. I have seen ass. (mind the period!) being used to mean assortment, assorted, en even assistant. (Yes, we have an ass. manager working here...).
On a receipt I would take it to mean other assorted (goods).