beggars can't be choosers 5/13

meaning

People who depend on the generosity of others are in no position to dictate what others give them.

ex.

A Hey! I'm hungry..

B Help yourself. I baked a cookei.

A I don't like Cookie. Don't you have other?

B Beggars can't be choosers!

贅沢言うなって感じかな笑