Nasolingus is the act of licking and sucking on a partners nose and nostrils. This may take place during sex or may be a stand alone activity. Nasolingus may involve the eating of the partner's nasal secretions.
More About Nasolingus
In BDSM play, nasolingus is the kind of activity that a Dominant might use demonstrate control over a submissive by forcing them to eat the Dominant's nasal secretions.