The 26-year-old sent the Hammers into dreamland when his 90th minute strike sealed a 2-1 triumph over Fiorentina in Prague.
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Bowen’s strike prompted Moyes to sprint down the touchline in jubilant celebration.
And upon the final whistle, ecstatic scenes broke out on the pitch.
West Ham stars went to celebrate with their 5,000-strong allocation of supporters.
As final hero Bowen approached with his team-mates, fans launched into their X-rated chant about the forward and partner Dani Dyer.
Players bounced up and down to the tune, and so did Moyes.
The 60-year-old Scot wore an enormous grin as he danced along – keeping a promise from back in March in the process.
Moyes vowed to “dad-dance” should his side go all the way in the Europa Conference League, after being asked about Lucas Paqueta’s slick moves.
He said: “I certainly would, yeah!
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“I certainly would, don’t worry, if I win a trophy, I’ll be flipping dad dancing and everything.
“Have you see the Scottish Gay Gordons and the real dancing? You don’t know what I’m talking about here..!”
It was Paqueta, 25, whose brilliant pass set up Bowen’s strike.
Said Benrahma had given West Ham a 1-0 lead from the penalty spot in the 62nd minute, before Giacomo Bonaventura levelled for Fiorentina five minutes later.
Last night’s triumph marked the first trophy success of Moyes’ managerial career since winning the Second Division with Preston North End in 2000.
He had since reached the FA Cup final with Everton in 2009, while winning LMA Manager of the Year in 2003, 2005 and 2009 during his Goodison stint.
Moyes also won the Community Shield in 2013 during his brief spell as Manchester United boss.
After the match, West Ham fans took to the streets to celebrate their first major trophy in 43 years.
Dyer, meanwhile, gushed over her man from home.
Alongside two crying emojis, she wrote on Instagram: “So proud”.
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