dropping the clutch means just letting it off. you do that with slicks cause they can hold the power to the ground.
slipping it means easing the clutch out slowly maintaining traction while holding the car near its peak torque area. when i slip the clutch there is a fine line between wheelspin and excessive wheelspin. its ok to have a little but when smoke starts rolling off the tires its excessive. i just went out to the backroads and practiced. with a 00 SI motor though like i had in my car the clutch is really weak. my clutch got too hot and started stinking. had to go home and let it cool off.