Definition of Grand Guignol in English:
 Grand Guignol
noun ˌɡrɒ̃ ɡiːˈnjɒlɡʀɑ̃ ɡiɲɔlˌɡrän ɡēnˈyôl
A dramatic entertainment of a sensational or horrific nature, originally a sequence of short pieces as performed at the Grand Guignol theatre in Paris.
 Example sentencesExamples
-  The result was a Grand Guignol operetta chock full of hissable villains, throat slashings, and narrow escapes, but also a commentary on the inherent evil of society.
 -  All the characters in some way had a Grand Guignol version of themselves.
 -  Sure it was a Grand Guignol of grindhouse violence, but ‘Bill’ is an elegantly structured work of B movie genius.
 -  The outcome is a Grand Guignol climax of jealous revenge.
 
Origin
  
French, literally 'Great Punch'.