When you take a girl out on a fancy outing and get laid afterward (pork) but you didn't have to pay for it (beans).
Bro; "Dude, did you get any pork from Stacie after Benihana last night?"
Dude: "Hell yeah, bro. Plus, she put it all on her dad's Amex--I didn't have to pay a dime!"
Bro: "Dude, pork *AND* beans!"
Dude: "Pork and beans, brother. Pork and beans."