They take a word like ugly, slice off the second syllable, and say “He’s ug!” They take the adjectives serious, hilarious, and ridiculous and, for a certain heightened effect, curtail them to ser—, hilar—, and ridic—, as in this hypothetical exchange: “OMG, are you ser?” “Yeah, it was totally hilar!” “That’s freakin’ ridic!” An indifferent bystander listening to this exchange might then chime in with "Whatev—," for whatever.
Another example in this vein that I’ve noticed recently is the use of swag for swagger. According to my 14-year-old daughter Judith, who uses this curtailment often and was delighted that her idol, the pop singer Justin Bieber, used it in his new song “Boyfriend,” swag means “confidence in your style.” Judith also uses it to express excitement or vigorous assent, as in "I've got two tickets to the Justin Bieber concert." "Swag!"
Have you heard or read any other examples of this type of abbreviatory slang? If so, please do share — with citations or examples, if possible.