When a women or man (the 'doorbellee') bends over on all fours and you (the 'doorbeller') approach from behind and, with the index finger extended, press on the rectum and then slowly insert the finger, as if ringing a 'doorbell'.
"Stacey was not aware that Nich was present while she was bent over reading a magazine on the floor in the nude until he approached her from behind and rang "The Doorbell."
