A popping sound may be the initial sign of disrupting a muscle stitch. With time, a bulge which may be more apparent when attempting to sit up from a laying down position. Let your doctor know. He/she may have you get an ultrasound to diagnose this for sure.
The location of your tattoo and the place where the surgery is performed are important at this point. It would be wrong to say anything about this without consultation. You can get contact with a Board Certified Surgeon to get the information you need.
Thank you for your question and congrats on the weight loss. It is definitely too much to combine all procedures in one setting. However, combining two procedures such as tummy tuck and breast augmentation/lift are great as they address some of big changes that happen after pregnancy and/or...