Green’s Dictionary of Slang

butter-and-egg v.

[butter-and-egg man n.]

(US) to act or pose as a wealthy provincial businessman or farmer.

[US]I. Einstein Prohibition Agent No. 1 249: With this information and accompanied by some ‘friends,’ including members of the nose-powdering sex, I butter-and-egged my way through the Tango Belt (as it was called) and played the high-flying sucker.