For those who aren’t familiar - CCC is the chaos computer club, they have lots of talks and events all about tech, politics, intel, hacking/security, etc.
I believe that’s the origin of “tits or GTFO” came from too, a cringey way of saying that they don’t care if your a girl if you say something dumb online. Though predictably it morphed into incel taunts and male chauvinist bullshit once the meaning was lost.