English Etymology yiff + -ing
Verb yiffing
#:quotations #:*"I always equate yiffing between furries, whether they be between anthro to anthro, anthro to non-anthro or non-anthro to non-anthro species, where both partners are sentient, to bestiaitly or zoophilia." — 1 #:*"Some furs are only able to get here at certain times of the week, and they may read your question about yiffing before seeing this message." — 2
