JIC (jik') n.; interjection. [rutledge, ca 1993, orig. abbrev. 
for Just In Case]: 1.) (n) something retained or performed as a preventative
measure, or as a cure for a bad situation after the preventative measures
have failed; ex:  "It's always good to have a JIC."  
--<a href = http://enuxsa.eas.asu.edu:80/~gnigh/>Greg Nigh</a>
2.a.) (colloq.)(interjection) A term which may be used to replace "just in case"
whenever that expression is appropriate; ex: "Always take toilet paper
with you when you go camping, JIC." Note that this form doesn't usually 
specify what the precauction is "just in case" of.  
2.b.) (adverb? Webster scratches his
head...) A verb modifier to replace "just in case"; ex: "I always
carry an umbrella in my car's glovebox JIC it rains."