As you may know, Xfce4 terminal supports the Quake style drop-down mode since version 0.6. Just a parameter
--drop-down will start xfce4-terminal just like quake, yakuake, or tilda.
It is advised to bind this feature to a shortcut in the keyboard preferences. Below steps will teach you how:
1. Open xfce4-setting-manager from Application menu or Alt+F2 Application Finder box.
2. Click on the Keyboard icon under Hardware section.
3. Under Application Shortcuts tab, click on the Add button and type in the command box
4. Click on OK and set a keyboard shortcut in next window.
Now you’re able to press the keyboard shortcut to launch a drop-down Xfce4 terminal. Click the button at right-bottom to open the preferences dialog and edit the width, height, opacity, duration and more!