Sc. [f. FANK sb.1] trans. To put (sheep) in a fank; to pen up (Jam.). Hence Fanked ppl. a., penned up; in quot. transf. of a sword: Set fast in the sheath.

1

a. 1600[?].  The Death of Parcy Reed, xxviii. in Child, The English and Scottish Popular Ballads (1890), VII. cxciii. 27/6.

        ‘We ’ll pay thee at the nearest tree,
  Where we shall hang thee like a hound;’
Brave Parcy raised his fankit sword,
  And felld the foremost to the ground.

2