I generally do not try a steal when UTG limps; "book play" suggests limping from UTG sometimes with AK, usually with AQ and similar strong hands. Plus, an AA trap by a limping UTG is always something to think about. So, the problem with this steal is that you are likely far behind UTG if he calls you. Even at $25, you have to credit UTG limpers with something like a decent hand.

I wouldn't, as your poll required, call your steal a donk play, but I think you should have waited for a different opportunity.