Someone on KVR coined this term. DCS - Drum Collection Slavery. When you have to have every drum sample set that's out there.
If you hate XLN because they aren't releasing new kits fast enough, you probably have DCS.
If you have to have Toontrack's Post Rock kit, even though you hate Sigur Rós, you have a bad case of DCS.
If you have multiple jazz drum libraries and have never played a chord more complicated than a minor 7, have multiple country libraries and don't know what a double-stop riff is, and have multiple metal libraries and don't even like distortion, you are the poster child for DCS.