A "dirty bag" technically defines bagged (as opposed to canned) whipped cream. However, the term can also be used to describe a mug of hot chocolate with bagged whipped cream in it.
"Hey, James, can you bring me the dirty bag from the fridge?" -(bagged whipped cream)
"Ben, can you heat up some water and make me a dirty bag with extra chocolate?" -(hot chocolate with whipped cream)
"Hey, Kayla, bring me a dirty bag with extra dirty." -(hot chocolate with extra whipped cream)
"What, you mean the dirty bag?"
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