sandwich action 

a threesome:

2 guys and a girl
2 girls and a guy
3 gay guys
2 lesbians

the logistics are a pain in the ass, though

Person One is a slice of bread... Person Two is a slice of bread... Person Three is the ham...

Get the picture?

sandwich action by Terra Imperator May 14, 2004

sandwich action 

a heterosexual three-way sex session, involving either two men and one woman or two women and one man; as opposed to a "choo-choo' (which involves three gay men or three lesbians)

Last night I got sandwich action with Gina and Maria!

sandwich action by Silky Smooth January 7, 2004