Someone who posseses an over the top '80s haircut.
Jenny: Did you hear about Britney's haircut?
Stephanie: OMG, its so Garvin.
describes the look of someone's face when they are told something so shocking that their eyes bulge out, their mouth opens, the entire room is stunned by association and time stops.
"Were you there when John told Jenn about how someone threw a skunk in his face?"
"Yeah! The look on her face was so garvin!"