Dictionary.com
Thesaurus.com

Buggin's turn

American  
[buhg-inz] / ˈbʌg ɪnz /

noun

British.
  1. promotion by seniority or rotation rather than merit.


Buggins' turn British  
/ ˈbʌɡɪnz /

noun

  1. slang  the principle of awarding an appointment to members of a group in turn, rather than according to merit

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Buggin's turn

1900–05; identity of the original Buggin or Buggins is obscure