Definition of sniffs:
(v) :
(ambitransitive) To make a short, audible inhalation, through the nose, as when smelling something.
(v) :
(transitive) To say (something) while sniffing, such as in case of illness or unhappiness, or in contempt.
(v) :
(intransitive) To pry; to investigate in an interfering manner.
(v) :
(transitive) To perceive vaguely.
(v) :
To be dismissive or contemptuous of something; used with at.
(n) :
(countable) An instance of sniffing.