anadrol 3 days out from a competition

i personallyhave never done this as i have not competed yet. someone has asked me about this. i have heard it will increase fullness, but my personal experience with anadrol never caused me to fill out in 3 days.how do you do this or by what mechanism does this theory work?

I know alot of ppl use drol in the final 2 weeks or so before a comp to help retain muscle while dieting. Other then that I don't know...