Wiktionary
swapping spit
vb. (present participle of swap spit English)
Usage examples of "swapping spit".
But he didn't, He knew that once they got to swapping spit there'd be no reining in till he found out whether he might or might not go farther.
What would've happened to the brigadier and the rest of us if you'd been swapping spit out there on that ridge the other night?