1) Cold sound 1) Smelling 
[behavior] == Background and history of sniffing == === Background === The behavior of sniffing incorporates changes in air flow within the nose. This can involve changes in the depth of inhalation and the frequency of inhalations. Both of these entail modulations in the manner whereby air flows within the nasal cavity and through the nostr...
• (n.) A rapid inspiratory act, in which the mouth is kept shut and the air drawn in through the nose. • (p. pr. & vb. n.) of Sniff
Sniff'ing noun (Physiol.) A rapid inspiratory act, in which the mouth is kept shut and the air drawn in through the nose. 
In computer terms, sniffing is listening (with software) to the raw network device for packets that interest you. When your software sees a packet that fits certain criteria, it logs it to a file.
May be annoyed or just talking to you