Homosexual slang for mouth of throat, developed around the turn of the 21st century to be used as a code for faggoty oral sex.

At Christmas.

About tea time.

It is derived from "chin knee", where after such acts, the man in question would rest his head on his partner's lap.
"Santa's coming down my chinney, and it feels so warm!"

"Your wang is tickling my chinney, Charles!"
by Dictionary Samurai April 15, 2004
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