i think hes talking about going up a jump and railsliding on a telephone line while slightly holding R(for style) and continually jumping and railsliding with R(style) so that the multiplier jumps up to x20.
for example. Instead of just jumping off a ramp and railsliding the telephone line for maybe 34,000 points. You railslide with style and keep jumping, spinning, and railsliding so that the multiplier gets really high and turns that 34,000 points into 420,000 points perhaps.
The higher the multiplier is, the more points your gonna get obviously.