nerdle
n.— «When I worked in the vet. hospital (animals—not soldierslol) we used “nerdles” in the litter boxes of cats from whom we needed a urine sample. It gave the cats something to dig around in and we could easily collect the sample when they were done.» —“Re: OT. Elephants!” by Liz Hampton Usenet: rec.crafts.textiles.needlework Jan. 25, 2002. (source: Double-Tongued Dictionary)