What you mean by mine?

What you mean by mine?

: that which belongs to me —used without a following noun as a pronoun equivalent in meaning to the adjective my Your eyes are brown and mine are green. mine. noun. Definition of mine (Entry 3 of 4) 1a : a pit or excavation in the earth from which mineral substances are taken.

What does mine too mean?

If you said "Mine too" or "Me too" it would be completely clear what you meant. I would say that technically "Mine" (meaning "My life") would be better but you will hear both.