From Longman Dictionary of Contemporary Englishthe fast lanethe fast laneinformalEXCITED an exciting way of life that involves dangerous and expensive activities Brenda is a lady who loves life in the fast lane. → fast lane
Examples from the Corpus
life in the fast lane• McCravey lived his life in the fast lane for 27 years.• They want to make life in the fast lane even faster.• Now at his lowest ebb, Marinello can reflect on life in the fast lane. 