Source : Webster's Revised Unabridged Dictionary (1913)

Abraham-man \A"bra*ham-man`\or Abram-man \A"bram-man`\, n.
   [Possibly in allusion to the parable of the beggar Lazarus in
   Luke xvi. --Murray (New Eng. Dict. ).]
   One of a set of vagabonds who formerly roamed through
   England, feigning lunacy for the sake of obtaining alms.
   --Nares.

   {To sham Abraham}, to feign sickness. --Goldsmith.