Cockblocker

Part of speech: noun

Definitions

1. A person who interferes with someone else's chance at sex or a romantic connection, often by getting in the way on purpose
2. Someone who spoils another man's attempt to win a romantic partner or sexual encounter by stepping in or interrupting
3. A meddler whose presence or intervention prevents a friend from making a sexual or romantic advance toward someone

Etymology: "Cockblocker" is a plain compound: "cock" in its slang sense of the male sex organ, joined to "blocker," someone who blocks or obstructs. The combination describes a person who gets in the way of another man's sexual or romantic pursuit, most often by interrupting, distracting, or steering a potential partner elsewhere. The word is recorded from about 1971, which places it in the wave of American slang of that period, when "blocking" a rival in pursuit of a woman was a familiar idea in informal speech. The modifier "cock" here is used in its vulgar anatomical sense, which is why the term has remained a slang word rather than entering general formal vocabulary.