I recently started doing little kid t-shirts and onesies. As a mother of two little boys, I love this saying. I originally saw this quote as "boy: dirt that moves" and I just think wiggles is more accurate.
"Wiggles" reminded me of "giggles" and what goes better with "giggles" than "twirl"? And thus, this little girl shirt was born.
If you are interested in a custom tee or onesie, just email me and I can work something up for you.