Conk/kɑːŋk/ Definition 1 of 4Pro Tip 1/2Slang Usage Remember, calling someone 'conk' can be humorous or insulting. Tom laughed and said, 'Nice conk!' Pro Tip 2/2Not Anatomical 'Conk' is informal, not used in medical context or formal descriptions. His conk was bright red from the cold, not 'His nose was erythematous.'