anything that you have that must go, either with you on a trip or thrown out in the trash
Don't eat that old ham in the fridge Bob. It's mustgoes from last week that I haven't taken out yet.
Damn Sally, why are you hoarding these mustgoes clothes from last year?
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Leftovers from a get together that are sent with or taken home by guests.
"Those are tastey looking mustgoes" says one woman looking at the leftovers after the family Christmas dinner.
"Mostgoes?" I ask.
"Yeah, MUST GO home with me" the woman smiles.