Among the others, I have seen 'sexting' cropping up with increasing frequency, but I believe my favorite is 'funemployed.' I have seen first hand the benefits of funemployment, and they seem, well, pretty fun. And "tramp stamp" is so 2004. Other favorites?
On a much less modern note, the English word 'friend' is historically interesting. It is one of the last remaining traces in Modern English of the old present participal suffix (along with 'fiend') so productive in Latin, where it appears as -ent (e.g. nom. sing. dicens [<*dic-ent-s], gen. dicentis). It comes to us through Germanic in which the suffix was largely lost. Thus it was, originally, 'the loving one.'
UPDATE: Stupid Blogger thought the above notation was a faulty HTML tag and cut my post. It has now been restored in full (though too late for GReader to pick it up, unfortunately).