"Hanky Panky" is a song written by Jeff Barry and Ellie Greenwich for their group, The Raindrops. It was famously remade by rock group Tommy James and the Shondells, who took it to No. 1 in the United States in 1966.

Donald A. Guarisco at AllMusic wrote:

The lyrics of this song convey the excitement of a hormonal lad driven mad by a girl who knows how to do the suggestive dance of the title, building themselves around the oft-repeated lyrical hook of "My baby does the hanky panky." The music is equally simple and infectious, building itself on simple verse and chorus melodies that bounce up and down in a pleasant, bouncy fashion. James' version is pure garage rock, a live-in-the-studio effort that layered low-slung guitar riffs over a shuffling stomp of a beat from the rhythm section. James topped it off with amusingly mush-mouthed vocals a la "Louie Louie" and an out-of-control guitar solo that is cheered on by the other band members.

Barry and Greenwich authored the song in 1963. They were in the middle of a recording session for their group The Raindrops, and realized they needed a B-side to a single, "That Boy John". The duo then went into the hall and penned the song in 20 minutes. Barry and Greenwich weren't particularly pleased with the song and deemed it inferior to the rest of their work. "I was surprised when [Tommy James version] was released," Barry commented to Billboard's Fred Bronson, "As far as I was concerned it was a terrible song. In my mind it wasn't written to be a song, just a B-side." Hanky Panky versions: Summits (1963) (Harmon 1017/Rust 5072), Raindrops (11-63), Tommy James & Shondells (2-64).

Another version has the song being written in a car at a lover’s lane, while “everyone else was making out, Jeff and I were making music.”

The song was recorded by "an obscure R&B girl group" The Summits in 1963, but failed to chart.

Although only a B-side, "Hanky Panky" became popular with garage rock bands. James heard it being performed by one such group in a club in South Bend, Indiana. "I really only remembered a few lines from the song, so when we went to record it, I had to make up the rest of the song," he told Bronson. "I just pieced it back together from what I remembered."

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Wikipedia