What are portmanteau words?

Portmanteau is a French word meaning "suitcase" and was first used in English by the writer Lewis Carroll in the novel "Through the Looking Glass", where one of the characters, explaining the meaning of a word says: "...a portmanteau: there are two meanings packed up in one word".
This is a very productive way of creating new words. You probably have heard about "Brangelina" and you surely know that it means both Brad Pitt and Angelina Jolie, the mythical Hollywood couple who, unfortunately, are said to be divorcing these days.

What about "Bollywood"? Yes, that's a blend between Bombay and Hollywood, and you use it to talk about the blooming film industry in India.
Some more examples are:

• Channel + tunnel = Chunnel
• Smoke + fog = smog
• Breakfast + lunch = brunch
• Camera + recorder = camcorder
• Web + log = blog

Do you know any  other portmanteau words? Post your answers!