A lot vs. Alot: 9 Grammatical Pitfalls
as a title of courtesy before a man's Christian name, mid-15c., unaccented variant of master. As a form of address, without a name and with a tinge of rudeness, from 1760.
Man; fellow; guy •Always used in direct address, usually to a stranger: Hey, mister, where's the turnoff for Bogota? (1760+)