From the College Heights Low Down, Vol 2, No 9, March 6, 1938:
WANTED: A THESAURUS. What with the crowded life of today and its rapid tempo, abbreviations are necessary all along to get the days work done. Old timers sometimes have difficulty in understanding the modern idiom, and when abbreviated the task is hopeless. Recently the editor was confronted with a letter containing “S.S.&G.” in it. After much research he found the meaning. To help others (which is our mission in life) we are listing a few common terms with definitions and each week this will be a regular department. Send in your queries.
Some of these meanings are lost to us today (M.I.K. anyone?) but “pass de butter” is clearly timeless.