Swap spit(s) slang
To kiss each other with both mouths open and tongues touch.
How can they swap spits in such a public place?
Mary felt her cheeks flush red when witnessing a couple swapping spits.
You know what! I've swapped spits with my girlfriend.
To kiss one very romantically and passionately
1. To passionately kiss someone, particularly in front of others.
2. To gain someone's favor by excessively flattering, fawning, or solicitous overtures.
To kiss voraciously and for a long time.
Used to indicate giving someone a kiss.
The verb "swap" must be conjugated according to its tense.
The origin of this slang is not clear.