The brown residue left on one's fingers or thumb after crumbling a significant amount of hash. See also "Bunning".
"Danny's been smoking so much soap-bar he's given himself Bunner's Thumb!"
The act of pretending to play the saxophone without having a physical saxophone within your possession.
*See also; air guitar, air drums etc.
"'Careless Whisper' is an Air Sax classic"
"I hear 'Baker Street' and feel an uncontrollable urge to Air Sax, and there's no shame in that"