PBA: If the latter, there is no issue. If you want to be Machmir boil up a pot of water (you don’t have to wait Ben Yomo) to be M’vatel the NA”T BAR NA”T D’heteira.
If the former, then there is no way there is enough Mamashus of hot meat on a popcorn kernel to affect your pot. If you want to be Machmir you can do a Hagala after Ben Yomo but there’s no way that that’s not Lifgam and… ew.