When a guy and a gal have sex while bundled up in a sleeping bag. The male will ejaculate within the bag and remove himself. He then will zip up the bag with the girl and stray semen inside and proceed to swing her about. For added effect the bag may be smacked against various objects like a tree or statue.
Veronica was being sassy, so Billy gave her the ol' Russian Sleeping Bag last night.
by Russian news August 09, 2013