What is the meaning of Sniff?

To make a short, audible inhalation, through the nose, as when smelling something.

To say (something) while sniffing, such as in case of illness or unhappiness, or in contempt.

To perceive vaguely.

To pry; to investigate in an interfering manner.

To be dismissive or contemptuous of something; used with at.

To intercept and analyse packets of data being transmitted over a network.

To inhale drugs (usually cocaine) through the nose, usually in powder form.

An instance of sniffing.

A quantity of something that is inhaled through the nose.

A brief perception, or tiny amount.

Cocaine.

A short inhalation sound, sometimes associated with crying.

sniff

Source: wiktionary.org