cursor dipped in X: n. 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!"