Newcastle fans were in stitches after Allan Saint-Maximin responded to a fan's x-rated celebration to his goal on Tuesday night.
The Magpies are through to the fifth round of the FA Cup for the first time in 14 years.
But they did not do it the easy way after being taken to a replay then extra-time by Oxford United.
In an exhilarating match at the Kassam Stadium, Newcastle emerged 3-2 winners thanks to a stunning goal from Saint-Maximin in the second-half of extra-time.
The Frenchman was reluctantly sent on by Steve Bruce to make sure of the result and was a standard above the rest.
And his goal showcased that, skipping past the challenge of two players before placing a powerful shot past Simon Eastwood.
The former Nice man celebrated the only way he knows how - extravagantly.
But one member of the Toon Army tried to outdo him - by bizarrely deciding to get his penis out.
As the away fans cheered on, one man charged down the aisle frantically pulling his kecks down to reveal his willy.
At the time, Saint-Maximin did not see the incident but after it went viral on social media it was only a matter of time.
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And the 22-year-old responded with a hilarious gif that had fans in stitches.
One said: "Hahahahaha what a celebration."
"You’re a goat man," another replied.
"This guy," a third said, accompanied with some laughing emojis.
While this supporter posted: "This man is brilliant."
"Get to the CHOPPA," another quipped.
Meanwhile, Bruce has urged his side to go all the way to the final this year, which they have not done since 1999.
"It was a hairy cup tie, great for the neutral but awful for myself and the fans," he said.
"It wouldn't be Newcastle without a story and if that's the story let's go to West Bromwich Albion and carry it on.
"When you look back and put your slippers on the FA Cup final is still a huge moment in this country. It was rekindled for me when I got there as manager of Hull City against Arsenal in 2014 and I vowed that I would never play weakened teams.
"A club like Newcastle can win five games and get to Wembley."