1. (noun) The feeling one has after staying awake far too late doing nothing productive and knowing all the while that one is doing nothing productive. Similar to, and can overlap with, a hangover, but usually slap-happier.
2. (interjection) Rhymes with silver.
There were no men on that infomercial, but last night I ordered Meaningful Beauty, but now that I've got the pilver I'm not sure it was a good idea, even after she cut the price in half.