Noun. From French.
“Someone who builds things without any clear plan, making things up as they go along”
Think any number of Homer Simpson creations, such as his ‘Kidney’ that was, in essence, a whistle glued to a beer can. France also has a chain of shops known as ‘Monsieur Bricolage’ which is a little like B&Q, and there is also the phrase ‘Monsieur le bricolage,’ which I’m assuming is some relation to a handyman (or one who thinks they are handy but perhaps aren’t so much…)