A portmanteau is when you take two words and mash them together to make a new word. This is dfferent from a contraction, in that there are no apostrophes, and do not describe a state of action. Portmanteaus were popularized (at least within the wrestling world) by the E&C Dynasty, although both the word and the practice existed long before either was born.
Examples of portmanteaus:
...more to come!