A woman is someone with XX chromosomes.

My definitions of a woman are simply XX chromosomes. An adult female. What about you?

woman is someone who says they're a woman. Your still not telling me what exactly a woman is

 i believe because she has female chromosomes she is a woman

If a four year old wanna call himself a woman i have to objections as to what he wants to identify as,

 i will call him a woman, if thats what he wanna be called,

but that does not mean he is one.

Same way you could ask yo homeboy, "what up dog" he aint an actual dog thats just what he wanna be called.