Is Tuesday named for a one-handed god?
1819, frequentative form of sniff (v.). Related: Sniffled; sniffling. The sniffles "runny nose, head cold" is recorded from 1825. Sniffly (1897) tends to refer to physical symptoms, while sniffy (1858) means "scornful, disdainful and disagreeable." Snuffy "annoyed" is from 1670s.
A runny nose from a common cold or allergy: lots of Kleenex for his sniffles (1770s+)