Moving Average of Oscillator is the difference between the oscillator and oscillator smoothing. In this case, Moving Average Convergence/Divergence base-line is used as the oscillator, and the signal line is used as the smoothing.
OSMA = MACD-SIGNAL
Full description of OsMA is available in the Technical analysis: Moving Average of Oscillator
Translated from Russian by MetaQuotes Software Corp.
Original code: http://www.mql5.com/ru/code/7785