Rusty trombone as a sexual act in which a man stands with his knees and back slightly torqued with feet at least shoulder width apart to expose his anus. The other partner typically kneels behind the man and performs anilingus while reaching up beneath the testicles or around the body to manually administer rapid up and down motions of the penis, mimicking the motions of a trombone player. The act is defined primarily by the physical orientation of the partners and the combination of anilingus with manual sexual stimulation; however, other positions and variations are possible.
In 2003, the Detroit, Michigan talk radio show Deminski & Doyle began an educational hour discussion of urban-legendary sex acts with the statement, "Try to describe carefully what a 'Cleveland steamer' would be..." and then went into details of the blumpkin and the rusty trombone. Fifteen months later, the Federal Communications Commission proposed a fine of $27,500 to the station's owner, Infinity Broadcasting, through a Notice of Apparent Liability (NAL) that specifically referenced rusty trombone.
Rusty trombone (dirty trombone) gained wider use in entertainment projects being developed for release in 2005. For example, comedian Andy Dick used the term in the 2005 documentary film as part of the infamous dirty joke of the . In seeming recognition of the phrase being a part of the filthiest of filthy language, news sources such as The Daily Telegraph,Slant Magazine,New Statesman, and Globe and Mail highlighted rusty trombone in their review of . In addition, in the 2005 movie The 40-Year-Old Virgin. the character Mooj stated, "It's not about these rusty trombones, and these dirty sanchez." In the film Tenacious D in The Pick of Destiny, actor Jack Black is seen in walking around the Venice Beach, California boardwalk in a Rusty Trombone T-shirt.