Children's game in which two teams are formed, each team links hands with their teammates. Then one team calls out "Red rover, red rover, we call (player's name) over" or something like that to the other team. Then the person's name that's called tries to break through the chain the other team made. If they failed to break through then the team gains control of the player. If they suceeded then the payer get to pick which side he/she wants to join, that side also gets the part of the chain that got broken off. Then it goes back in forth. Was popular in 1970's.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

(n.) Title, usually given to a male. Describes a person who only visits, texts back or phones after he is "called over" but never initiates contact.

To have sex doggy-style while the girl is on her period.

A swingers' party game in which groups are in different rooms, and individual players are called from room to room, usually in turn. "Red Rover, Red Rover, send _______ right over!"
When the red rover arrives, he or she becomes the center of the calling group's attention until the next call.

threesome group sex gang bangMFM FMFcircle suck

To pass or send an object, document, image, etc., either physically or via the internet. From the childhood game where children link arms and call one another to join from one side to the other, but with objects/documents or similar things.

A red rover is the sexual act of putting one's penis in a girls vagina during her menstration, then flipping her over and inserting the red penis (rover) into her anus. To be a true red rover, one must recite "Red rover, red rover, flip her over".