Preparation: Pour the Tia Maria into a shot glass. Pour the Baileys in afterwards, very slowly.
General Comments: Well, it's a fuck-ton better than actual Guinness, that's for sure. Actually, it's better than most things, Gaelic or otherwise. Irish cream with a dash of coffee - what's not to love? If you don't like Gaelic coffee, then there is quite simply something wrong with you. This is... just a more direct delivery system. Short of injecting drinks straight into my veins, of course, but hopefully we're still a little ways away from that.
Crappy name, though. Like I needed to be faced with the idea that Guinness is capable of reproduction.