The rumbling troll is a meme under the 'brainrot' category. It was first created on 26th May 2024 and depicts a 'cringy' video but near the end it shows a picture of a troll that includes concrete sounds in the background. This can also be used if someone is being cringy.
"I'm waiting for the rumbling troll"
"Susie was talking about her fan-fictions again, I was waiting for the rumbling troll the whole time"