What does Bonkknob mean?

Bonkknob meaning in Urban Dictionary

principal Entry: bonkknobPronunciation: bäŋk-näbFunction: intransitive verbEtymology: Middle English bonkeknobbe; akin to center minimal German baunkknubbeDate: 14th century1 a : to-fall lacking one thing : never to attain <bonkknobbing showing up for court had disastorous repercussions> b : to diminish or die-away <until our house line bonkknobs> c : to fail miserably <he completely bonkknobed figuring out just what the eight letter palindrome was>