SARCKS are SARCasm delineation marCKS. Defined by set of parentheses surrounded by a set of asterisks, they are used to clarify a sarcastic tone in an e-mail, text message, or other typed correspondence. Any text between these marks should be read in a sarcastic tone. Much like quotation marks show speech, sarcks show sarcasm.
*(Sure, I'd love to work your Saturday morning shift.)* is a good use of sarcks, Thus letting your slacker co-worker know that not only will you NOT be working their shift, but it was ridiculous for them to ask you to in the first place.