Definition: one who insincerely professes love for the sake of gain
This delightful term is fashioned from the earlier noun cupboard love. Rather than give a dry and precise definition of this we shall instead quote from our earliest citation for cupboard love, which comes from 18th century British court records, The Proceedings at the New Bayley (1756): “Now, there is a Kind of Love in the Old Stile, termed Cupboard Love; and it often happens, that what People judge to be an Intrigue with a young Woman, turns out, on a nearer View, to be only an Intrigue with a Leg of Mutton and Turnips. This Kind of Love is frequently seen among certain Gentlemen at Counry Quarters, the Curates in City Parishes, Attornies Clerks, and young Barrister, and may, doubtless, descend to all Persons who have larger Stomachs than Purses. So, Gentlemen, go out.”
Bread-and-cheese-friend, e. A true friend as distinguished from a cupboard-lover.
—Rev. W. D. Parish, A Dictionary of the Sussex Dialect, 1875
(from Merriam-Webster Online, "List of 10 Polite Words for Impolite People")