A helmet wearingwindow licker is someone who acts as if they pass their time day to day by wearing a helmet, and licking windows, in other words a retard
(derogatory) ~ sl.: euphemism for a person of mentally challenged status. Etymology: C20 - Derived from the stereotyped behaviour of mentally challenged people, observed to place their open mouths into prolongued contact with the external windows of public or private transport on which they are seated.
Somebody profoundly lacking in personal dignity and social grace. While not actually mentally disabled, such persons are often so enabled by family members or sympathetic friends that they become hopelessly unaware of the ridicule, revulsion, or downright murderous rage that they evoke from everybody else.
I don't care if he's our ride home. If that short bus window licker doesn't stop yelling at the movie screen I'm going to break a bottle over his fucking head.