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opening up a can of whoop ass 

To unleash fury and anger, in the form of whooping ass
When Tom found out his friend Bill was nailing his girl, he solved the issue by opening up a can of whoop ass on Bill.

opening up a boy with the cold ones 

when the vamps bite into a lad and suck him like a capri-sun pouch. commonly used as slang in the frat/soror vamp communities. often accompanied by a circle of vamps chanting in a frat bro way, not a cult way. like a harem but for tasty tasty blood-all the immortal mosquitos les gusta ๐Ÿ˜๐Ÿ˜๐Ÿ˜.
โ€œDid you see Edward drinking him dry over there in the circle of people chanting, โ€œchug, chug!โ€ ?โ€

โ€œHe must be opening up a boy with the cold onesโ€.