The 11th Edition of Websters Collegiate Dictionary is out, and it has some interesting additions.

For example:
* "headbanger" (defined as both a hard rock musician and a fan)
* "dead presidents" (paper currency)
* "McJob" (low paying and dead-end work)
* "Frankenfood" (genetically engineered food)
* "longneck" (beer served in a bottle with a long neck)

Thanks to Resource Shelf for the examples