from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To mess things up, to corrupt, to be devilish.
- v. To bump a particularly old topic thread on the internet or in an electronic forum, by posting an ironic or humorous reply to a previous message.
See the C. S. Lewis book, The Screwtape Letters, from the compound of screw + tape. The internet sense is thought to have originated on the internet Flintstones forum, Pebblescrap. (Wiktionary)