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1.
Literally meaning a noob or rather being pro at being a noob. originating from "scrub" but somehow being mispellled to becoming scrun a word used occasionally by asians, especially chinese people.
by THE Scrun November 28, 2011
 
2.
Originated by Dafydd "pipeline" Williams of ATMOS Software Productions. scrun is a situational word that changes meaning depending on it's context. It is a usually a general exclamatory, or can be used in place of "stuff".
"I have a whole heap of scrun here."
"Scrun you, hippy!"
"I'm just scrunning about."
by Dafydd Williams November 30, 2003