The product of the expression -3x3x(-3)x(-3) is

To simplify the expression \(-3 \times 3 \times (-3) \times (-3)\), we can calculate it step by step.

1. Start with the first two numbers: \[ -3 \times 3 = -9 \]

2. Now take the result and multiply it by the next number: \[ -9 \times (-3) = 27 \quad (\text{since multiplying two negative numbers results in a positive number}) \]

3. Finally, multiply the last number: \[ 27 \times (-3) = -81 \]

Thus, the product of the expression \(-3 \times 3 \times (-3) \times (-3)\) is \(\boxed{-81}\).