a problem or subject best understood by females US, 1992.
2
the various hygiene steps taken by a female pornography performer before a sex scene. Also called 'girl stuff' US, 1995
a girl thing
Something that exclusively pertains to or is understood by females. No offense, Dad, but it's a girl thing, so I really need to talk to Mom—is she home?
girl thing
n. something that women do; something that appeals to women. You wouldn’t understand. It’s a girl thing.