one pump chump

== English == === Etymology === Chosen for the rhyme. From the tendency of people suffering from premature ejaculation to ejaculate after a very short time, perhaps even after a single pelvic thrust or “pump”, during sexual intercourse. === Pronunciation === === Noun === one pump chump (plural one pump chumps) (informal) A premature ejaculator (person suffering from premature ejaculation). (informal, by extension) Someone who only does something once. === See also === one-and-done