I believe Graphic Design is the use of several elements of media, art, etc. to add function and form to art. I tried to convey that using a diverse range of design elements here. The poster itself displays a play on the words using direction, and color.
If you couldn't guess the message, it's:
"What is graphic design? Graphic Design is what I design. I design Graphics"
Now guess the direction.
(I thought it'd be cool to nail in as many aspects of graphic design within each entry so I added in a logo.)