Egg-Swapping 

When two young hipsters (typically Japanese) carefully spit eggs into each others' mouths as a way of making out. It was featured on the =3 RayWilliamJohnson show and uploaded on Youtube (called "Egg-Swap: WTF Japan Seriously!?").

Yo, did you see that weird ass video on YouTube??? Two chinks spitting eggs into each other...egg-swapping...

Egg-Swapping by EggrohboiN_D November 1, 2011

Egg Swapping 

When two lesbians engage in scissoring while both on their period.

"we were both dropping our eggs this month and we decided to try Egg Swapping"

Egg Swapping by Larry The Unstable Guy January 10, 2021

Egg Swapping 

When you stick an egg up your ass so it gets hard boiled by your body heat and then you and your boy kiss your ass holes together and you shit the egg into your boys ass.

You: Bruh you wanna try egg swapping?
Your boy: Ah hell ya!

Egg Swapping by papa_thirsto May 10, 2018