Used primarily as an insult, the term "darsh" originally derived from an episode of South Park. In the said episode the character Stan Marsh was on a ski-trip and a random guy challenged him to a race. In an attempt to piss Stan off, the random guy said: "Stan Marsh... more like Stan Darsh!" And since then all the cool kids have been saying it.
YOU TALKING TO A DARSH:
"Way to go, you god damn darsh!"
A DARSH TALKING TO YOU:
"I just darshed that up, like whoa."