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And in french a "gaffeur" is someone who makes hilarious mistakes.

In English English 'gaffer' means 'boss'.

Or the head electrician on a film or theatrical set - https://en.wikipedia.org/wiki/Gaffer_%28filmmaking%29

"gaffer" translates to "rubbernecker".

Very weird! I've always heard it used to refer to English soccer club coaches

Also the person in charge of lighting on a film set.

You mean English football clubs. Nobody says soccer in Europe mate :p