What does it mean to have coronary artery califications?i had a 4 way bypass in august 2014

In yr case moot poin: If you have had CABG (bypass) then by definition you have coronary artery disease. SO it is not surprising that your native arteries have "calcifications" = hardened cholesterol. Given your history, you ought to be on optimal medical therapy, statins, ASA, beta-blocker, etc. to keep your bypass grafts patent.

Ca is a sign of CAD: About 20% of plaque in the coronary arteries is calcified. Presence of calcium in the coronaries is a very sensitive indicator of the presence of coronary artery disease, even in its earliest stages, In your case, you would be expected to have calcification in your coronary arteries, since you have known blockages that required bypass surgery in the past.