When your having anal sex and part way through the sex act you quickly slip in an ice cube with no warning.
To perform the back end cold front properly and succesfully, to start you will need to have a drink next to you when you plan on having anal sex. Don't give any warning as to what you are going to do. The surprise is key. After a few minutes and the sphincter muscle is loose get a good size ice cube in your hand and when the moment is right slip it in the anus very quickly and keep penetrating the anus pushing the ice cube in farther.
Drunk, horny hot air balloonists reviewing a poor weather forecast the evening prior to a flight and lubing up for a daisy chain group fuck as a consolation to an early morning balloon flight.
The radar tomorrow looks like shit. Stop at the Walmart and grab their best bottle of silicon lube, looks like the best we’re gonna get out of this weekend is a moist back door cold front.
Similar to the Cold Shoulder, the cold backpack is when you are trying to find a seat on the bus and people put their baggage next to them on the seat to stop you from stealing their one seated glory.
When you are riding a public transportation system, such as a school bus, and someone who wants to sit alone nonchalantly pushes their backpack to the outside of the seat to shun and/or reject the possibility of sitting with them.
Guy on Cell Phone walking onto bus: "Yes Mom I did my homewor... hold on this freshman bitch just gave me the cold backpack, I'm gonna have to empty a leg on this douche bitch.”
Douche Bitch:(thinks to himself) "Oh Shart!"