Most effective method of burning fat?

Yeah, that was exactly what I was thinking....

So lets use my workout from today as an example:
15 reps of hammer curls, 3 sets, @ 15lbs
15 reps of shoulder presses, 3 sets, 12 lbs
15 reps of bent-over rowns, 3 sets, 40lb bar
15 reps wide stance squats, 40 lbs
And then I do an ab circuit as well. What would you change the above to in terms of lifting heavy/less reps?

Is that the order that you do the exercises in? Also what other exercises do you do? Sidesteal's advice on how to get to heavier rep ranges is solid so I won't touch that, but I do think you might want to consider reorganizing your workout a bit. I would replace shoulder presses with another pulling exercise and do shoulder press on a different day with other push exercises, and then either up the number of sets on squats by a lot (like 5 sets) or up it to three and add another leg workout (this is assuming you don't do leg workouts on other days).

More than anything though, I would say do squats first in your workout, and curls last.

Eating as clean as you can, I upped my protein intake and decreased carbohydrates to see results. I still eat carbs, just after lunch I do not eat any starchy carbs. This is when I started to see more definition in my arms and I got back into my skinny jeans. Oatmeal in the am, sweet potato for lunch and then no other carbs after that except for non starchy veggies. Abs are made in the kitchen:) I am learning this.