One who has reached supreme heights of gothicness.
Dude, that guy was a fucking uber-goth!
Those who have reached a level of gothiness in excess of what one would suspect a living human to be capable of.
OMG, I just got an uber goth to autograph this box count chocula!!!
A Person that poses as a goth and thinks that being goth is all about Writing sad poetry and Listening to what they assume to be goth music, like for example, Marilyn Manson, which is not, in fact, Gothic music.
(dude):"hey can I hang out with you guys?" (Ubergoth):"to hang out with us you have to wear all black, write depressing poetry, and glumly walk through graveyards. You are a Conformist!"