to inhale through the nose, usually in short rapid audible inspirations, as for the purpose of identifying a scent, for clearing a congested nasal passage, or for taking a drug or intoxicating fumes
2.
to perceive or attempt to perceive (a smell) by inhaling through the nose
mid-14c., of imitative origin; possibly related to snyvelen (see snivel). As a synonym for smell (v.) it dates from 1845. In ref. to cocaine from 1925. The noun is first recorded 1767; the scornful sense is from 1859.
n. a drink of liquor. (See also snort.) : I'd like just a sniff of that Scotch.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Computing Dictionary
Sniff definition
A C++/C programming environment providing browsing, cross-referencing, design visualisation, documentation and editing support. Developed by UBS Switzerland and marketed by takeFive Salzburg. [Jargon File]