A Guillaume 

The art of wiping out a system or entire infrastructure or company in 1 simple command.

Jonathon: "Boss, All of the systems have gone offline, nobody can take any cash out of the cash machines. Literally, they are all broken"
Boss: Who the fuck has done a Guillaume?

Wendy: Boss, do you mind if I jump in there and just update it myself cos IT are busy?
Boss: We do not need another fucking Guillaume on our hands.

A Guillaume by Randy Tarvey April 20, 2018