What is a mugwump? An insult only Boris Johnson would use

Heads are scratched, dictionaries consulted and references unearthed in an effort to understand the attack on Jeremy Corbyn

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The foreign secretary has officially entered the general election campaign in a manner befitting no other politician, by introducing a real head-scratcher.

In a column in the Sun, Boris Johnson referred to the Labour leader, Jeremy Corbyn, as a “mutton-headed old mugwump”, leading to much confusion about the meaning of the term and a peculiar kind of fallout just six weeks before the country heads to the polls.

Related: 'Mutton-headed old mugwump': Boris Johnson attacks Corbyn

Pretty sure he is, mate @jk_rowling http://pic.twitter.com/h1NCW0DbXX

Here's a #mugwump spotted in his natural environment. Shy, elusive creatures who live among the elite & never stray from their own species. http://pic.twitter.com/YF8QhYKq2H

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