Ahhhhhh, neat trick you say! Well, there are two ways to do this.  I used Eye Candy on this one, but it is not necessary.

Add a new layer to the background.  Add text,(tip,vertical text works better as you can see).  Next deselect your text.  If you have Eye Candy, click on the Image menu and choose Plug-in Filters, Eye Candy, Motion trail.

Here is how it should look

Next, click on the Shapes selector tool, set it to Rectangle in the Tool Options dialog box, and select from the bottom of the text to the bottom of the trail.

Next click on the Image menu, Deformations, Perspective-Vertical.

Set at 100 Difference .

Here is how it should look.

 

Now, maybe you want your text to stand out a bit more. Click on the text tool and apply text exactly the same as it was the first time, leave selected.  Take on the Image menu, Plug-in Filters, Eye Candy, Glass.

Finished

 

So you say you don't have Eye Candy?  Here is a way to do it without Eye Candy. After you have added your text on a new layer.  Click on the Image menu and choose Rotate.  Rotate by 90 degrees, either way does not really matter.  Click again on the Image menu and choose Deformations, Wind.  Apply the Wind filter and play with setting until you get close to the same effect as you saw Eye Candy with the Motion Trail.  Rotate text back into vertical position and proceed with the steps.

I encourage you to play around!  Never know what new technique you might discover.