"T minus zero" means "out of time."

This comes from a countdown convention used in by both the American military and NASA.

Generally, it is used when counting down to a major event that will happen at a specific time.

Mathematically, T is time, minus whatever amount of time is left until the event happens.

If the News Years ball is dropping in 10 minutes, one could say "The ball is dropping in T minus 10 minutes and counting!"

Therefore, "T minus zero" means that there is no time left.
I was working on my term paper all night for my morning class, and all the sudden I looked up at the clock and realized I was t minus zero.
ayon kay HanClinto ika-11 ng Mayo, 2004
2 Words related to T minus zero
The termination of a countdown. Afterwards, time is denoted by 't plus <amount of time>'
We are at t minus zero. We have ignition and liftoff.
ayon kay pythonspam ika-13 ng Mayo, 2004
What Mission Control in the Houston Space Center never says. They stop after T Minus 1 because T Minus zero is not significant in the countdown.
T Minus 5,4,3,2,1,0...o theyre already gone!
ayon kay Will ika-12 ng Mayo, 2004
it means "now". t=time... minus zero..
t minus 20 would mean 20 minutes from now, assuming time was like a stopwatch counting down.
ayon kay Bethany Nolan ika-12 ng Mayo, 2004
Time to go, i.e. liftoff or the beginning of an operation.
T minus zero, time to leave...
ayon kay RGE ika-13 ng Mayo, 2004
when a space ship of some sort is about to take off
tminus 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, blast off
ayon kay cullen ika-12 ng Mayo, 2004
There is no time left and you need to make a decision. To fuck or not to fuck. That is the question.
When I encountered a stripper, I had t minus zer to make a decision to screw her.
ayon kay JOHN ika-11 ng Mayo, 2004

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