Glish night vary in themes and have everything from live artists, spray paint, pole dancers, strippers, glow sticks and lolly pops.
Oh my, I don't remember what I did at glish! Whoops.
It is imperative that the direct object in question only have a questionable reputation by mainstream standards, and not be all encompassingly uncool.
"Glish" can be used to describe things (particularly music and movies), places, activities (specifically behavior), and people. When used to describe people it is generally to give the connotation that this is someone who is not traditionally attractive, and has a unique, unconventional beauty/hotness. It can of course just mean that they are quirkily cool.