swappin spit 

Kissing... especially as far as making out. Comes from the act of exchanging saliva.
Usually only heard in guy-centric locales: locker rooms, frat houses, etc.

Yo dog, Angela started swappin spit, and before you knew it, we were all over each other.

swappin spit by Leif June 10, 2006

swapping spit

French kissing; snogging

We'd park by the lake and just swap spit for hours. Swapping spit is so much fun.

swapping spit by mandingoe May 24, 2004

swapping spit

another word for making out

u and ur mom were swapping spit last night

swapping spit by dave hammonds April 19, 2005

spit swapping 

Kissing

My gf and I did some serious spit swapping in the bleachers yesterday.

spit swapping by Mcirowave4097 April 27, 2016

swapping special spit 

the act of put your saliva in your partner's mouth for fellatio

Mikey always swapping special spit with Christie to clue her in on what he was thinking.

swapping special spit by Sillygritty July 30, 2022

swapping special spit 

the act of put your saliva in your partner's mouth for fellatio

Mikey always swapping swapping special spit with Christie to clue her in on what he was thinking.

swapping special spit by Sillygritty July 30, 2022

swapping mock spit 

The act of swapping "std's" with someone while you kiss or makeout.

I saw Joey swapping mock spits with Jane on Tuesday.

swapping mock spit by Jamie Whit May 1, 2008