This is a condition that may be associated with TMD (temporomandibular disorder). There is a disc between your lower jawbone (mandible) and your skull that acts as a shock absorber. Something (usually a traumatic event) happened to cause your jaw to slip off of the disc, and now it clicks or pops as it jumps on and off of the disc. You should see a dentist very soon to be sure that the condition does not worsen. Keeping to soft foods and a warm compress may help soothe the area.