G'st of C's
G'st of C's is a name for someone who is a total pain in the arse and doesn't even know it.
My neighbour is the G'st of C's. He plays loud music at 2 AM.
My brother is the G'st of C's. He steals my snacks and then says he's hungry.
My dad is the G'st of C's. He drinks all day and then forgets my birthday.