2. A date to utter when something hasn't been done in a long time, referring to the idea that January 1, 1970 is the "beginning of time". Used when something seems like it hasn't been done since the beginning of time.
2. Romeo:Man, you stink! When was the last time you showered?
Joliet:I took a shower on January 1, 1970.
2. The last time the gas station changed the coffee in the coffeepot on January 1, 1970.