Green’s Dictionary of Slang

cosmoline n.

[SAmE cosmoline, a form of purified solid paraffin]

(US milit.) butter.

[US]Phila. Eve. Ledger 20 July n.p.: ‘Pass the cosmoline and sand; I’m going to try to improve this slum.’ [...] What is really meant is, ‘Pass the butter and sugar. I’m going to try to improve this stew.’.