Third nipple on a man. Example: Even though it's usually done as an outpatient procedure, Chandler was hospitalized for his nubbinectomy. The surgery was a success, so he's now sans nubbin.
NUBBIN, NUBBINECTOMY
Meaning of NUBBIN, NUBBINECTOMY in English
Slang English vocab. Английский сленговый словарь. 2012