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The angle measure of DBC is 68°.
To find this, we need to use the fact that the sum of the angles in a triangle is 180°. Since we know m∠ABC is 160° and m∠ABD is 92°, we can find the measure of ∠BCD by subtracting those two angles from 180°:
m∠BCD = 180° - 160° - 92°
m∠BCD = 180° - 252°
m∠BCD = 68°
Therefore, the angle measure of DBC is 68°. So the answer is 68°.