We spent some time 'swapping stories' about our college days. [=telling each other stories about our college days]
He wanted the window seat so we 'swapped'. = ('Brit') He wanted the window seat so we 'swapped over'.
I'll 'swap' my sandwich for your popcorn. = I'll 'swap' you my sandwich for your popcorn.
(..) You crazy son of a bitch! I'll kill you! Stop! No! Don't shoot him! This guy Eddie, the owner-operator, comes up and says: "I want to swap tires." I said, "These are new tires." "Why don't you throw in something else, like your wife?" His wife was Miss New Jersey . (..)1976 Taxi Driver