Wiktionary
n. (context US English) Activities which exclude outsiders.
Wikipedia
Reindeer Games (also known as Deception) is a 2000 action film directed by John Frankenheimer in his final theatrical film, and stars Ben Affleck, Gary Sinise and Charlize Theron. The film received poor reviews.
Reindeer Games is the debut album by The Killjoy Club; a hip hop supergroup consisting of Insane Clown Posse ( Violent J & Shaggy 2 Dope), Da Mafia 6ix ( DJ Paul, Crunchy Black & Koopsta Knicca) and Axe Murder Boyz member Young Wicked. The album was released by Psychopathic Records on September 2, 2014.
Usage examples of "reindeer games".
And they both wondered why her father didn't want to play their reindeer games.
She promised to visit after school, no matter what other fun and funky reindeer games Giles had planned.