looking for synonym to "in fashion", "in vogue", "popular"

Temat przeniesiony do archwium
There is this noun defining something trending at the time. I totally forgot and cannot find it in google. Maybe you can help. Something like "It's a killer", but "killer" is not the word i'm looking for. Hope you understand what I mean. It's a slang word for when something it's really popular, kinda a must-have. "These shoes are a total ______" or " This design is an absolute_____"
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