When you say them in public and people are just like what the heck are you talking about? And you laugh and feel bad not explaining but you don't want to explain because it's an INSIDE joke! Not and outside joke.
This isn't a girly thing at all. Idk why people call this a "girly thing". It drives me insane. A lot of these "girly things" can be guy things too. So don't go around call it a 'girly thing' because it's not.