You are basically going to do the same as you did for the “Driftin-Daddy-O” trophy. (Assuming you followed my guide on that trophy)
1. Load up a mission that has a jump in the mission area. A good one is the warehouse mission located at joes apartment area.
2. Go to the warehouse and there should be an area with 2 jumps along the long straight near the objective.
3. Blow up the vehicles parked near the jump, best to use a grenade as you can throw it and get back into your vehicle quickly. Now after you blow them up and you have a multiplier, do the jump being sure that your score gets banked at the end.