Origin of blue mass
An Americanism dating back to 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for blue mass
The doctor gave him a lot of blue-mass pills, which Si threw into the fire as soon as he got back to his quarters.Si Klegg, Book 1 (of 6)
"You'd better take a dose of blue-mass," her aunt suggested when she had sighed seven times dolefully at the tea table.