Back-to-back life sentences

Slang for consecutive life terms imposed by a judge when the defendant was convicted of more than one crime, each of which carries a life sentence. Making the sentences consecutive and not concurrent (served at the same time) lessens the chance of parole: Unless specified "without possibility of parole," a life sentence really means 20 or more years in prison before parole is possible. A convict serving concurrent life sentences could conceivably receive parole on all of them after serving the minimum term, but someone with consecutive sentences would have to begin serving the second sentence upon being paroled for the first.