Is it the default text for the wiggle property?
wiggle(freq, amp, octaves = 1, amp_mult = .5, t = time)
So the shortened terms are
You can see this by:
Make a layer
Alt or Option-click on the Position control on that layer
Click on the Expression Language Menu (it's a little solid circle with a ...
That script uses the variable shrink, which paradoxically increases with time. Just make it decrease with time, e.g. by replacing the first line with these two:
var endTime = 123; //how long you want it to take, in seconds
shrink = endTime - time;
Or make the radius the product of the time and a constant, rather than dividing the radius by time, by ...