Someone who is stupid, and who doesn't think before they act/speak. Spoonerism of "mentally retarded," and has come to mean someone who isn't retarded, but acts like it.
My brother said I'm mental. I proclaimed I'm not mental, he then stated that I'm retarded no I'm not retarted he then claimed that im Mentarted and that's where it all started.
the word was first used on face book by Jesse Hallam. to describe how Staphylococcus aureus and Helicobacter pylori viruses and bacteria from pig farms, mutated into super bugs and how its both mutation and retardation.
used to describe something that deviates from the norm, in a bad way.
janice got a makeover the other day she was aiming for occultist rocker but shes all mutarted now.
Examples of Metarded including riding the travel several stops in the wrong direction, switching trains at the Arlington Cemetery stop, and frequently missing,"doors closing, step back," by 30 seconds or less.