Hamsteren comes from Dutch supermarket culture around Albert Heijn, whose long running Hamsterweken promotions used animated hamsters to encourage shoppers to stock up during deals. The word itself plays on how hamsters stuff their cheeks and store food for later, which made it a natural joke for bulk buying. Online, the short sound was lifted from that world into meme edits and soundboards, where Dutch viewers in particular use it as shorthand for cheeky hoarding, bargain hunting and grabbing more than you really need.