IT's not a GFY things, its a general internet thing
Tits or GTFO is used in a way to say; If you are going to use your gender to gain further attention on a board or comment section of a predominantly male user base, you are basically saying "I have tits, give me more attention". Therefore you might as well go all out and show your fucking tits or get the fuck out.
It's also how Instagram works in general. Want views? show your tits...
https://www.urbandictionary.com/defi...ts%20or%20gtfo