You know the ones... they're not reeaaaaally words at all, but they've wormed their way into your vernacular and spread among your friends.
Mine are:
Mahoosive - like, really big, man.
Amazeballs - better than amazing
Muttwang - mind-numbingly pointless
Boswellox - just another way of saying b*llocks.
Ackshual - derived from a variety of hilarious misspellings of the word "actual" on a parenting forum I use