What does it mean when a guy asks you if you would put out for them?

Well hun there are two meanings.

There's 'put out' as in will you have sex with him and then 'put out' as in will you be his girl on the side but not like girlfriend. Just a chick to mess around with. So will you like send him naked pics, videos, etc. So put out is basically sex or sexually explicit stuff he can masturbate to.