What does the joke that makes me a desert switch mean?

I don't know if you have the wrong number, but you should make me a sandwich.

In my opinion, this is not a joke at all. I don't know what you saw. There are two main types:

1 is a sexist word, which means that when a man is hungry, he will ask a woman to "make him a sandwich" because some men think that a woman is the representative of cooking for him. Girls also laugh at themselves. For example, a woman's boyfriend quarrels with a male chauvinist, and a woman's friend will use such self-deprecating words as "You'd better make him a sandwich".

2, the amount ... is a threesome ~ ~, as if all three people are men! Because ~ ~ ... it's interesting.