Submissive to me means giving up control, saying yes with respect, humbleness and at times enthusiasm to whatever is asked or commanded by my Master because I trust him completely.
I had to put "sub, usually", in my profile because I don't take orders all the time. I cannot give up total control at all times, nor can he take giving the orders all the time. It's what turns us on, but it's not our whole life. I have to be fairly dominant in my avocation, and I think the submissive state brings me back into balance.