The phrase "hard throttle" refers to pressing the gas pedal of a vehicle forcefully, causing the engine to quickly increase in power and speed. Full definition
The transmission shifts very smoothly under normal acceleration and offers snappy shifts under hard throttle. (topspeed.com)
If I were to do a track day, I'd want to make my sessions short and take a torque wrench and trolley jack, to swap the 20in fronts and rears around so I didn't muller the front pair in a day, but the Type R copes with hard throttle inputs remarkably well, given what Honda has asked it to do. (autocar.co.uk)
Steering is still hydraulic, so some feedback is present, though the torque can sometimes be felt through wheel under hard throttle in 2WD mode. (driving.ca)