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1.
The response one gives when replying to a casual "I'm sorry." If the "sorry" is serious, then this word should not be used. It is only meant for casual "sorry's."
While talking on the phone:
"Hey dude, sorry the call got dropped"
"Rosk"
by Miles Tennant May 21, 2009
 
2.
An exclamation used in text / instant messages that indicates extreme satisfaction with one's IT person.
"Nate, you totally fixed my computer. Rosk!"
by LabelBabyJr. August 19, 2008