bis zum Gehtnichtmehr in English: to the utmost extent, as much as humanly possible, past the point of reason (especially of an activity associated with an effort or cost, or of negative qualities)

Meanings

colloquialto the utmost extent, as much as humanly possible, past the point of reason (especially of an activity associated with an effort or cost, or of negative qualities)
[…] und erst 1813 hat Generalleutnant Repnin, der war damals in Dresden russischer Stadtkommandant, weil der sächsische König nämlich bis zum Gehtnichtmehr auf Napoleons Seite mitgemacht hatte – also jedenfalls hat General Repnin […][…] and only in 1813 did General Lieutenant Repnin - he was the Russian city commander in Dresden back then, because the king of Saxony had gone along with Napoleon long past the point of reason – anyway, General Repnin […]