Aer; a female fallen being defined from making everyone around her uncomfortable from saying that she's pregnant. Synonyms; Morgon Freeman, Your Mom, That Hot Girl From Class. Origin; Originally starting in the 21st century, Aer was a popular 'bungie.net' post. We believe that these ancient people also rode lamas for fun*. Citation: Fun; referring or pertaining to being forced onto a lama for a tribal satanic ritual.