"Once saved always saved" is a slur on the actual belief, which I see as "if the things of this world are more to you than Christ, you were never of Christ". The only reason one would refer to it as "once saved always saved" is if he wants to imply that those of us who believe in eternal security are out merrily sinning with the expectation that God forgives us anyway.... someone with that sort of attitude, is most likely not saved....
I could say the same thing about anything. If watching football causes you to reject Christ, in some way, you weren't Christ's to begin with. If debating politics causes you to 'lose' your faith, you never had faith in the first place.
I apologize for the perceived slight, I meant no insult. I know many non Catholics who believe in eternal security, if that is the term you prefer, and not one of these people believes that they are free to do as they please. Most lead very moral lives, in fact. I just meant to point out that I as a Catholic, do not hold the same belief as you do.