1764, "sound made by snuffling," from snuffle (v.). Old English had snofl (n.) "phlegm, mucus." The snuffles "troublesome mucous discharge from the nostrils" is from 1770.
1580s, from Dutch or Flemish snuffelen "to sniff about, pry," related to Dutch and Flemish snuffen "to sniff" (see snuff (v.2)). Related: Snuffled; snuffling.
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