a- prefix
Something stuck to the front of a word that makes it mean something else, usually something dumb.
She stuck 'a' on 'cool' and now it's 'acool' and it's not even cool anymore.
My dad added 'a' to 'car' and now it's 'acar' and it's not a car, it's a disgrace.
My brother called me 'ashit' and I told him I was gonna beat him up.