bucking bronco

== English == === Noun === bucking bronco (plural bucking broncos) A wild or untamed horse, characteristically difficult to ride. (by extension) A spirited or uncontrollable person. A mechanical bull in the form of a horse. (humorous) A supposed sexual position that involves the man telling the woman something disagreeable during sex (e.g. that he has a sexually transmitted disease, or prefers another woman), causing her to struggle or lash out.