Lindsay Lohan -- Judge Pooh-Poohs Community Service -- More Hours Ordered

Lindsay Lohan and her community service organization just got slammed by a judge Wednesday morning ... a judge who threw out more than half of her hours.

The judge in Lindsay's probation case ordered LiLo to do another 125 hours ... this after the prosecutor called BS on the service she performed.

Most of the hearing was conducted privately in the judge's chambers, but hizzoner did call the work Lindsay did "unacceptable."

TMZ broke the story ... prosecutor Terry White was indignant over the work Lindsay did for CSV in London, saying in one case she got credit for six hours of community service work ... even though four hours of those hours were for acting on stage and the remaining two were for meeting fans.