Someone who tends to exaggerate their accomplishments to impress others. There may be a kernel of truth in their claims -- making it difficult to call 'bullshit' on them, not to mention the social risk involved in doing so -- but their exaggeration extends far beyond what might be considered remotely truthful.
More often than not, a dorky male with no real accomplishments to their name.
Jill: I've taken up learning the violin as a hobby.
Jack the embellisher: Oh, well I used to be a concert violinist.
Jack's friend: Lay it off dude, you learnt the violin for 8 weeks in primary school, and gave it up because you found it too hard.
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.