Remember the scene at the end of “Flashdance” where Jennifer Beals’ leotard suddenly develops a curious bulge in a particularly intimate area? Richard “Crazy Legs” Colón does, because it was his junk that had the unexpected cameo.

The wildly successful 1983 romantic drama, set in Pittsburgh, features Beals as a welder by day, dancer by night. For the movie’s final scene, her character, Alex Owens, performs a complicated routine featuring a break dancing move called the whip backspin, which entails spinning continuously on her back, with her legs tucked in to her chest. It was so difficult that neither one of Beals’ body doubles could do it, so producers called on the then-16-year-old Colón, who, alongside his break dancing group the Rock Steady Crew, had already made a short appearance in the movie.

He donned a wig, shaved his peach-fuzz moustache, squeezed into a leotard (no taping or tucking) and stepped to the beat.

“It’s funny when you slow that scene down and see what’s really going on,” he tells The Post, more than three decades on. “There’s a lot of manhood!”

Even before then, Colón had made a name for himself as a prominent member of the world-famous Crew (a revolving group of break dancers), which had emerged from The Bronx in 1977 at the dawn of hip-hop.

It’s for that reason that Legs and the Crew are being presented with the lifetime achievement award at the McDonald’s B-Boy Royale II — the city’s largest break dancing competition — on Saturday at the NYU Skirball Center.

“It was our little ghetto game; we didn’t know it was going anywhere,” reflects Colón, now 49 and splitting his time between Jersey City, NJ, and Puerto Rico.

But break dancing, or B-boying, rapidly became established as one of the four basic elements of hip-hop culture (along with rapping, deejaying and graffiti art), and as the genre’s popularity spread across the world, the Rock Steady Crew got a taste of the rock star lifestyle.

“One time, in 1982, we were in the Roxy in Manhattan, and Normski [aka Norman Scott, another Rock Steady member] was dancing. Farrah Fawcett comes over, watches him dancing and flips him a $100 bill. He was about 12, and shouldn’t even have been in there!”

In 1983, they performed for the Queen of England and found themselves cracking open Cristal with Richard Branson. “Mean while, rappers in The Bronx were still trying to get Moët,” laughs Colón.

Other hip-hop movies such as “Wild Style” (1983) and “Beat Street” (1984) also featured the Crew, and they even landed a record deal, which led to the single “(Hey You) The Rock Steady Crew” hitting the UK Top 10 in 1984. But as a new generation of hip-hop stars became dominant in the late 1980s, Colón and the Crew gradually became sidelined.

“There was a time that I was unemployed, but the ‘Flashdance’ residual checks kept coming in,” he says. “That really helped.”

The Rock Steady Crew still performs to this day, and although Colón no longer break dances competitively himself (he retired in 2012), he is president of the group. When he recruits new members, he ensures that they line up other career options — outside of perfecting moves like the whip backspin.

McDonald’s B-Boy Royale II is Saturday, 7 to 10 p.m. at the NYU Skirball Center, 566 La Guardia Place; nyuskirball.org. Tickets are $25.