From Wiktionary, the free dictionary
poor man's latte (plural poor man's lattes)
- (informal) An americano to which the purchaser adds a large amount of cream to simulate a latte in order to save money.
2007 May 7, Felicity Shoulders, “POOR man's latte?”, in Faerye.net[1]:The other day a guy ordered a poor man’s latte in a particularly annoying way.