Not sure if this is the one; found it on Google, attribution:


SENILE DELINQUENT

On the 22nd day of November
The day that they shot Kennedy
I become a fully paid up member
Of The Flat Earth Society
Acting like your older brother
Dressing like your brother's boss
You can't judge a book by its cover
But you can tell how much it costs

I'm a fucking senile delinquent
Delinquent with a capital D
For services to serious drinking
I should get an O.B.E.

You say tomato
I say tomato
But I'll never be a vegetable
You say Karl
And I say Harpo
I'm politically incorrectable

I'm a fucking senile delinquent
Senile with a capital S
Celebrated sensible thinking
Is something that I couldn't do less

I'm a fucking senile delinquent
Delinquent with a capital D
For services to serious drinking
I should get an O.B.E.

On the 22nd day of November
The day that they shot Kennedy
I become a fully paid up member
Of The Flat Earth Society

SENILE DELINQUENT
  
         A    C#     B
  On the 22nd day of November
  
  The day that they shot Kennedy
       A           C#      B
  I become a fully paid up member
         A            C# B
  Of The Flat Earth Society
  A                C#    B
  Acting like your older brother
  A                  C#        B
  Dressing like your brother's boss
      A             C#           B
  You can't judge a book by its cover
      A                C#      B
  But you can tell how much it costs
  
  G             A        D
  I'm a fucking senile delinquent
  G                 A       D
  Delinquent with a capital
      G           A       D
  For services to serious drinking
  G               G   B
  I should get an O.B.E.
  
  A         C#
  You say tomato
          B
  I say tomato
           A          C#    B
  But I'll never be a vegetable
  A       C#
  You say Karl
            B
  And I say Harpo
  A         C#    B
  I'm politically incorrectable
  
  G             A      D
  I'm a fucking senile delinquent
  G             A       D
  Senile with a capital
  G          A        D
  Celebrated sensible thinking
     G                A           B
  Is something that I couldn't do less
  
  A             B      E
  I'm a fucking senile delinquent
     A              B      E
  Delinquent with a capital
      A           B       E
  For services to serious drinking
  A               B   C#
  I should get an O.B.E.
  
         A    B      E
  On the 22nd day of November
      A                  B    E
  The day that they shot Kennedy
       A           B       E
  I become a fully paid up member
         A            B  C#
  Of The Flat Earth Society