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1.
To land the craft you are riding (sailboard, snowboard, skis, etc.) nose first into the ground or water and come to a quick stop.
When landing after a jump on a sailboard, one must keep the nose of the board up to avoid from darting into the water just like a yard dart does in your front lawn.

"I got some big air, but yard darted on the landing" or "man that yard dart hurt bad"
by Greg Hannan November 30, 2007
 
2.
One who Commits sexual crimes against animals, and or forest creatures, While Vomiting on them
Dont be Yarddarting with the Forrest creatures you sicko
by John April 24, 2003