What does it mean to smell the goose on a cloudy day and send it home at night?

1: Let's talk about the origin of this poem first;

Smell the geese on cloudy days and send them home at night. ("send a high card shark"

2. Explain:

On a rainy day, I heard a wild goose fly by and let out another plaintive cry. Maybe alone?

In this weather, a tramp who went out for a long trip came back in a boat!

Please refer to.