From Wiktionary, the free dictionary
Shitgibbon compound of shit + goblin.
shitgoblin (plural shitgoblins)
- (slang, vulgar, humorous) A rude, obnoxious, or contemptible person.
2000 March 11, CLF93 [username], “Re: **NEW VERSION** MindBender v1.2 4434”, in alt.horror.cthulu[1] (Usenet):OK, NOW, THE ONLY THING THAT'S GOING TO GO DOWN DUE TO DEMAND IS THIS SHITGOBLIN'S FACE IN THE CEMENT!
2000 June 6, Seig Hailie Selassie [username], “Re: ahm - I Smell Frying Haxor Butts”, in alt.hackers.malicious[2] (Usenet):Try to talk about hacking, ShitGobliN.
2005 April 17, Venger [username], “Re: Iraq Inching Closer to Civil War”, in alt.sports.football.pro.dallas-cowboys[3] (Usenet):Gee shitgoblin, what day did YOU receive your notice to report?