Since it is near USA Thanksgiving, it could be turkey, or turkey meat?
Just a shot in the dark.

""Turkey has a larger than average proportion of methionine and cysteine than other meat - both are sulfur bearing amino-acids that can lead to bad odours. Under closed condition (such as in a closed package) both can lead to a smell much like a fart. If it's originally packed in CO2, it can even worsen the smell"".