mandil
Mandil is a expression used by extremely intelligent people (for example a nerdiac) to offend the mentally challenged, when they try to point out something that looks like an obvious mistake - but absolutely isn't! A mandil is a joke/reference beyond ordinary comprehension!
Nerdiac: That was a great mandil!
Nerd: What in the what now?
Nerd: What in the what now?
Mandilism
Adding a terrible song to a collaborative spotify list. The act of vandilising a playlist.
Michael added Ed Sheran to out playlist... that's straight up mandilism.