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It effectively means that you don't have a true hard CL on the card; if you were to make a purchase that would technically put you at over 100% utilization (how much over depends on the issuer and your usage/payment history with that issuer) it could be approved. This is pretty much how a revolver issued by AMEX works but off the top of my head I'd guess that your particular card is a Visa Signature.
You'd have to understand the requirements related to your specific card but issuers can require that the overage in its entirety along with the normal mininum payment all be paid down before the current billing cycle closes else there's an additional fee assessed.