This song has been accredited to Flogging Molly, The Dropkick Murphys, Bondo and The
Rovers, and despite thorough research I can't seem to find the original author (Though my
is that it's authored by the much older Irish Rovers)

At any rate, the song couldn't be simpler, and while the previous chords were alright,
were out of key. It's three chords with light finger picking in between, so I suggest
to the song as you play. All chords are played either four or five times, depending on 
tempo you play at, and your strumming abilities.

  G (320003@1)                      C (x32010@1)         GI (320003@1)bang on the door but she wont let me in
  G (320003@1)                             (picking)   C7'Cause (x32310@1)you're sick and tired of me reeking of gin.
  G (320003@1)                                  C (x32010@1)         GYou've (320003@1)locked all the doors from the front to the back
  G (320003@1)                       (picking)   GAnd (320003@1)left me a note telling me I should pack.
 GFuck (320003@1)you, I'm drunk!
 C (x32010@1)             GFuck (320003@1)you, I'm drunk!
 G (320003@1)                  G (320003@1)          (picking)      CPour (x32010@1)my beer down the sink I've got more in the trunk!
 GFuck (320003@1)you I'm drunk!
 C (x32010@1)          GFuck (320003@1)you I'm drunk!
 G (320003@1)                                (picking)       GAnd (320003@1)I'm going to be drunk 'till the next time I'm drunk!

(Repeat verses & refrain)