There are a couple of metaphors in English of the form `pen dipped in
X' (perhaps the most common values of X are `acid', `bile', and
`vitriol'). These map over neatly to this hackish usage (the cursor
being what moves, leaving letters behind, when one is composing
on-line). "Talk about a {nastygram}! He must've had his cursor dipped
in acid when he wrote that one!"
[glossary]