"excessively tidy person," 1959, from neat (adj.) with a punning play on beatnik.
Entries linking to neatnik
neat adj.
1540s, "clean, free from dirt," from Anglo-French neit, French net "clear, pure" (12c.), from Latin nitidus "well-favored, elegant, trim," literally "gleaming," from nitere "to shine," from PIE root *nei- "to shine" (source also of Middle Irish niam "gleam, splendor," niamda "shining;" Old Irish noib "holy," niab "strength;" Welsh nwyfiant "gleam, splendor").
From 1540s as "well-shaped, well-proportioned; characterized by nicety of appearance." Meaning "inclined to be tidy" is from 1570s; sense of "in good order" is from 1590s. Of liquor, "straight, undiluted," c. 1800, from meaning "unadulterated" (of wine), which is first attested 1570s. Informal sense of "very good, desirable" is noted by 1934 in American English, but in many earlier senses in English since 17c. neat seems to be simply a vague commendatory word; variant neato is teenager slang, by 1968. Related: Neatly; neatness.
beatnik n.
coined 1958 by San Francisco newspaper columnist Herb Caen (1916-1997) during the heyday of -nik suffixes in the wake of Sputnik. The first element is from Beat generation (1952), which is associated with beat (n.) in its meaning "rhythm (especially in jazz)" as well as beat (adj.) "worn out, exhausted." Century Dictionary (1902) has slang beat (n.) "a worthless, dishonest, shiftless fellow." Originator Jack Kerouac in 1958 connected it with beatitude.
The origins of the word beat are obscure, but the meaning is only too clear to most Americans. More than the feeling of weariness, it implies the feeling of having been used, of being raw. It involves a sort of nakedness of the mind. [New York Times Magazine, Oct. 2, 1952]
"Beat" is old carny slang. According to Beat Movement legend (and it is a movement with a deep inventory of legend), Ginsberg and Kerouac picked it up from a character named Herbert Huncke, a gay street hustler and drug addict from Chicago who began hanging around Times Square in 1939 (and who introduced William Burroughs to heroin, an important cultural moment). The term has nothing to do with music; it names the condition of being beaten down, poor, exhausted, at the bottom of the world. [Louis Menand, New Yorker, Oct. 1, 2007]