The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom (at 0 Kelvin).

its something to do with a number i think im 69 years old im retired

When you're out tagging or doing graffiti, it's smart to take a Second, they can watch your back, and look out for cops.

when you agree to someones opinion.

In addition to a point made earlier.

Filling your plate with food for the second time

The duration of 9,192,631,770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 132.91 atom.