To 'whale' in a game or 'whaling' is a term for gamers or gambling addicts who spend a good huge amount of money on video games or casinos. Since a whale is huge and they pay hugely for gambling or gaming, you can see why this is a thing.

With gamers, microtransactions existed for them within free-to play games (e.g. loot boxes, in-game currency, booster packs, cosmetics, etc.), gacha-like games, mobile games, battle-royale games or anything along those lines.

Gamblers are people who whale tons of cash on slot machines, poker and other natures of casino games and gambling.

"Whales" was a phrase first used by video game publishers to describe their main customers who insufferably liked to gamble their money for in-game items.
Bob: "Hey, Dylan. Guess what happened: I convinced my mum to buy me V-bucks and I spent a heck load on Fartnite last night. So cool, dude."

Dylan: "That game is for toddlers. I see why you needed her to buy it for you. Because toddlers rely on their mummies, and you like to whale money within a crappy game, to buy things you don't need. Player Ultimate Battlegrounds is way better than your game."

Sarah: "Guys, guys, guys... come on. It's not that bad. I spend my free time whaling my student funds on Weeb/Grand Order to get the best units with Gacha hatchers and to be a better player, haha... I think I'm the worst than both of you combined."
by Taz (The Legend) June 28, 2018
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to assault, maul, or generally pummel another with great vigour and enthusiasm. To deliver a beating.
Huckleberry Finn says of his Pap (father) that “He used to always whale on me when he was sober.” (Mark Twain)
by Sassielassie April 21, 2010
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When a person is submerged in water and they slightly emerge their anus out of the water and lets loose a high velocity fart spraying water and/or fecal matter resembling a Whale surfacing for air.
Position 31 in the "fartmasutra" is called "The whale".
by Fartmasutra May 3, 2019
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a certain type of socialite who is renowned in bars and nightclubs for spending ridiculous amounts of money in one visit, often dropping tens of thousands of dollars in one night.

"Known in the industry (as they are in Vegas casinos) as "whales," this elite class of partyers pays from $20,000 to $100,000 a night to satisfy their every whim. That might mean bodyguards, protection from unwanted media attention or a steady stream of beautiful people ushered to their table." - LA Times
Mr. X would taunt the other whales at different tables, and they would go back and forth out-buying each other on who could spend the most on champagne. In the nightclub industry we call them champagne wars. Mr. X would order so many bottles that him and his guests would legitimately spray $1100 bottles of Aces of Spades and Dom.
by ladybasshead December 23, 2013
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To punch; to attack. Origin: possibly Maine, USA slang.
by VAKI5 May 7, 2005
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when a man uses his weiner as a harpoon to impale an obese woman
John's into whaling these days, looks for targets at Weight Watchers meetings.
by DJAD May 9, 2007
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