NOISE DISTURBANCE Trophy
You honked more than 100 times.
Tap the rear touch pad to honk your horn or use the icon in the bottom left of the screen (looks like a horn) simply press either 100 times.
This is the quickest gold I have ever earned I just spammed the rear touch for a minute or two and once the trophy popped went into the settings and turned "Honk touch area" to 0%, as will annoy you big time and has no use that I can tell. And even if it does you can always use the icon.