Well, here in California, it stands for "significant other," which I thought was a joke at first - but now it seems to be common speech. It means the person one sleeps with.
Which has very little to do with one's mother's bible.
-Joe Offer-


...and even though it's not the song that was requested, here's "Dust on Mother's bible:

Dust on Mother's Bible
Buck Owens 1966
Slow Waltz D#

  Chorus
          D
  There's dust on mother's Bible
       G                 D
  Its cover's worn with age
      G                 D
  And tho it's old and wrinkled
                  A      D
  Mama's there on every page
  
  The night the angels called her
  Mama called me to her side
  And handed me her Bible
  Said "Son, let God be your guide."
  
  Chorus
  I picked up mother's old Bible
  To my heart I pressed it tight
  And I heard her softly whisper
  "Son, I'll meet you on the other side."
  
  Instrumental Break
  I kissed my mother's old Bible
  And I wiped away the dust.
  Oh you never know until she's gone
  How you'll miss your mother's love
  
  Chorus

|D|D|D|D|G|G|D|D|G|G|D|D|D|A|D|D|
Buck plays this in D# on the recording I have.
Capo at first fret and play as D.