To find the original cost of the meal, we can set up the equation based on the information given.
Let \( x \) be the original cost of the meal. Since the coupon offers a 25% discount, the amount saved with the coupon can be expressed as:
\[ 0.25x = 3 \]
Now, we can solve for \( x \):
\[ x = \frac{3}{0.25} \] \[ x = 3 \div 0.25 \] \[ x = 3 \times 4 = 12 \]
Thus, the original cost of the meal was \( \boxed{12} \) dollars.