A person (man or woman) who does not trim or shave their public area. The term "retro" tends to elicit mental imagery of hirsute 70s porn stars.
"I went to go down on this hot girl, but had to stop when I couldn't find the goods through her bush. Damn, she was retro."
By Eleanore
Retro
going backwards or in reverse, back to a previous era in style or appearance; from the Sputnik-Space Race Era ... retro rockets, firing retro rockets enabled a space craft to break orbit and return to the gravitational pull of the earth for re- entry