From Longman Dictionary of Contemporary Englishbe no great shakesbe no great shakesinformalBAD AT to not be very good, interesting, or skilful The work’s no great shakes, but at least I’m earning. → great
Examples from the Corpus
be no great shakes• The food we got there was no great shakes.• Secondly, and crucially, Professor Griff is no great shakes as a rapper.• At school I was no great shakes at it, or anything. 