Ex
From Tardis Wiki, the free Doctor Who reference
Mickey Smith referred to the meeting of Rose Tyler and Sarah Jane Smith as "the missus and the ex", telling the Tenth Doctor "welcome to every man's worst nightmare". (TV: School Reunion)
When her previous incarnation appeared before the Twelfth Doctor, Missy noted "you've met the ex." (TV: World Enough and Time)
Upon the stored belongings of his many previous girlfriends being destroyed by a Dalek Executioner, Nick joked "ex, terminated." (TV: Eve of the Daleks)