The story
Blend of p-value + hacking, from "p" for probability. Coined by researchers Uri Simonsohn, Leif D. Nelson, and Joseph P. Simmons, in 2014.
Etymology from Wiktionary, CC BY-SA 4.0.
p-hacking
Today it means: The practice of reanalysis of data until a desired result is obtained which is statistically significant. Full definition →