Can I Get a Fake Tattoo After Tummy Tuck?

As long as your scar is fully healed, it should be ok.  Make sure you do not have any allergies to the material by doing a skin test and plaving it someplace else.  Make sure this is ok with your PS and also avooid tanning at this point, as your scar may darken from direct sunlight. 

A tummy tuck is a safe and effective procedure to contour the abdomen, create a tight waist, and remove extra skin, fat, and stretch marks.

In our practice, we have seen many patients that have received a tummy tuck elsewhere and present to our clinic for a revision surgery. Many of these patients have placed the tattoo over their original scar to help camouflage. We find that however this tattoo usually does not hide the scar but can in fact draw attention to it.
Your best bet is to work with a plastic surgeon that is board-certified by the American Board of plastic surgery. During the preoperative workup be as honest as possible with your plastic surgeon about your goals and inform him or her about your activity and the style of clothes that you like to wear. In our practice we have patients bring in the cltohes that they typically wear when we are creating their surgical plan and designing the incisions.
Keep in mind that a great discussion with your surgeon and a well-placed incision will always hide the scar better than a tattoo after the surgery.