The phrase "tailgate opening" refers to the act of opening the back door or gate of a vehicle, particularly trucks or SUVs, that swings downwards or horizontally. Full definition
Additional optional equipment were front and rear carpet mats # 90, keyless entry with start / stop button, electric tailgate and hands free tailgate opening # 630. (nextgreencar.com)
Also coming is the option of the rear tailgate opening with the wave of your foot underneath the vehicle. (cheersandgears.com)
The all - glass tailgate opens wide to reveal a highly functional cargo space with integrated under - floor storage. (japanesesportcars.com)