The incident took place on Wednesday evening at Teufelsee, or the Devil's Lake, a popular bathing spot in Berlin's Grunewald forest.
Adele Landauer, a personal coach, who shared the photos, revealed that the beast had first pilfered some pizza before snatching his hi-tech prize.
"Nature strikes back!" Landauer wrote on Facebook, saying that the man "gave it his all" in trying to retrieve the computer.
She said onlookers "adored him how focused he stayed and when he came back with his yellow bag in the hand we all clapped and congratulated him for his success".
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Die Fotos...
Posted by Adele Landauer on Wednesday, 5 August 2020
The forest is known for its wild boar, which sometimes roam into the city streets in search of food.
A 60-year-old woman who was also swimming at the time told Bild newspaper an entire family of boar visited the lake at the time of the incident.
"They weren't shy at all," the woman, who did not give her name, said. "It was as if the mother wanted to show her young how people live.
"The owner of the bag ran after the boar in his birthday suit. All the sun worshippers roared with laughter."
The hot-footed nudist has not been named.
Gonçalo Trindade, a Twitter user who shared the images online, had a take on why the man was nude.
"He was naked cause, well, Germans," Trindade tweeted.
Freikörperkultur, or Free Body Culture, remains enduringly popular in Germany, particularly in Berlin and the former communist East.
There are many designated nudist bathing spots, but it is not uncommon to see people sunbathing in the altogether elsewhere, including central Berlin's Tierpark.
