I'm fairly good at thinking up insulting nicknames, but I only ever give them to people above me in the work hierarchy. A boss where I currently work is called Jan, and he's always fucking whinging about one thing or another, so I call him Jankerd (crybaby). A boss I had last year was called Onno, and he was fucking disorganised, so I called him Onnoverzichtelijk (disorganised). One of the managers there was a fucking idiot but he always walked around like the cock of the walk, so I called him Schaakduif (chess pigeon). His name was Abel so I'd also call him Incapabel. There was a lad there called Pepijn who I called Hoofdpijn (headache) for a laugh once or twice. You have to make your fun where you can, sometimes.