You can listen to it
Strangely enough, fitting in with Goblin's Drugs Theme, there is a song by Hallucingen (Simon Posford of Shpongle) called Gamma Goblins on his Lone Deranger album. It's a great goa/psy-trance tune although hardly his best in my opinion. I was going to put up the Infected Mushroom mix of Gamma Goblins for you to listen to as I think it fits better than the original, out of context at least, but I found a video on youtube where someone has put a Gamma Goblins video together using bits from old National Archive footage. I think the main video being used in it is called something like "Drugs are like that", which is basically a preachy video about how playing with lego is like taking drugs.
So what is an actual Gamma Goblin then? I came up with the image on the right a few months back. Its basically a composite of two overlapping copies of the current banner image turned on its side and a little image jiggery pokery done to it. I thought it looked like some kind of monster thing so I added the greek symbol for Gamma around its neck and called it the Gamma Goblin. I once asked a friend of mine what it looked like, he thought it was tits and a thong. So maybe thats it, maybe the Gamma Goblin is just tits and a thong. If anyone has their own ideas on the matters of Gamma Goblins, tits or thongs, please let me know in a comment :)