Dictionary.com
Thesaurus.com

Londonistan

British  
/ lʌnˈdʌnɪˌstɑːn /

noun

  1. an informal name for London, as considered by some people as a base for radical Islamists

"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 Londonistan

C20: from London + Persian -stan place of; modelled on Pakistan and Afghanistan