I don't know what the current skinny is, either, but I think that if you look and act like the typical tourist who is not schlepping an outrageous amount of baggage, you're likely to be able to tuck frozen steaks in amongst the T-shirts and walk through the nothing to declare line. Don't put it on your declaration form! The worst that would happen is if you get your bags searched by Belize Customs, some Customs agent may decide he's going to have a good steak dinner and confiscate the meat!