adjective/ʃlas/
very drunk; exhausted, very tired
“C'est ce que j'ai cru comprendre. J'étais déjà schlass à ce moment-là.” — That's what I thought I understood. I was drunk by then.
Synonyms: ivre, saoul, imbibé, aviné, crevé, fourbu, épuisé, claqué
Borrowed from Alemannic German schlass (“soft”, especially of melting snow; also “languid, weak”). Futher origin unknown. Perhaps distantly related with English sleep and slack. The word is attested in Switzerland and may have been borrowed there. Whether it is also native in Alsace seems unclear; it is at any rate not in the Wörterbuch der elsässischen Mundarten.