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1.
"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.
by May 11, 2004
621 108

# Words related to T minus zero:

nasa time

2.
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.
by May 13, 2004
195 105

3.
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!
by May 12, 2004
51 90

4.
it means "now". t=time... minus zero..
t minus 20 would mean 20 minutes from now, assuming time was like a stopwatch counting down.
by May 12, 2004
59 102

5.
Time to go, i.e. liftoff or the beginning of an operation.
T minus zero, time to leave...
by May 13, 2004
51 99

6.
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
by May 12, 2004
29 98

7.
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.
by May 11, 2004
43 214