12c., gosshien "make noises in the stomach," later (c.1400) "rush out suddenly, pour out," probably formed onomatopoeically in Eng. under infl. of O.N. gusa "to gush, spurt," related to geyser. Metaphoric sense of "speak in an effusive manner" first recorded 1873. Gusher "oil well that flows without pumping" is from 1886.