NAY
You'll thicken your obliques.
Developing atrophic muscle is a GOOD THING since it pulls the fat, fascia and overlying dermis INWARD providing a thinner appearance.
The best way to achieve this benefit is no different than any other muscle group INCLUDING ABS, high repetitions and low weight.
I found obliques as an 'isolation exercise" can be helpful providing they are performed as an agonist/antagonist exercise (the static contractile forces of one oblique works against the rotary contractile force of the opposing oblige) WITHOUT USING ADDED WEIGHT.
This is best accomplished using an approximately 4 foot horizontal cylindrical "stick" placed over the Traps and grasped with both hands. The motion involves SLOW rotation AND side bending against the opposing set of obliques.
jim