cocksucker

The word is a compound formed entirely from native English elements. 'Cock', from Old English cocc, originally meant a male bird, especially a rooster, but has been used as a vulgar slang term for the penis since at least the early 17th century. 'Suck', from Old English sūcan, retains its core meaning. The agent suffix '-er' creates a noun denoting a person who performs the action. The term's literal meaning is transparent, and its primary modern use as a general-purpose vulgar insult derives from the taboo nature of the act it literally describes, applying the label to express extreme contempt.

Structure: cock + suck + er - cock (Old English): A rooster; used vulgarly to refer to the penis. - suck (Old English): To draw into the mouth by creating a partial vacuum. - er (Old English): An agent noun suffix indicating "a person who does something".