snotting
n.—Gloss: the practice of deliberately spreading a disease (between horses). «I am particularly concerned about media reports that prominent owners and breeders in NSW are engaged in a practice known as “snotting” or deliberately spreading the virus.» —“‘Finland’ gets a ‘start’ on her rivals” by Andrew Eddy The Age (Melbourne, Australia) Oct. 2, 2007. (source: Double-Tongued Dictionary)