Wiktionary
swapped spit
vb. (en-pastswap spit)
Usage examples of "swapped spit".
One day you'll wake up and find that you're married to a husband and a father, a wife and a mother, and you'll wonder whatever happened to the lover that you swapped spit and sweetness with over a crap table.
You're commencing to steam me with some squat about a kid I've never even swapped spit with!