Turn It In Edit Meaning

1.

A Michigan term for turning in (giving up) a car fully paid for to get a new car

My daughter's car was a 2004 Mazda MPV, when she told me that it was paid off, I told her, "Well, its time to "Turn It In" and get a better deal on a new car."

See mazda

2.

Used if a prior arrangement is terminated by either party usually due to laziness, a lack of interest or tiredness.

Knock it on the head

Calton - "You wanna come round and watch Contact?"

Steph - "Turn that right in, that film is incredibly shite !"