From Wiktionary, the free dictionary
From за- (za-) + шмат (šmat).
зашма́т • (zašmát)
- too much, too many (more than is desirable or required)
- “зашмат” in Belarusian–Russian dictionaries and Belarusian dictionaries at slounik.org
- "зашмат" in Belarusian-Russian dictionaries and Belarusian dictionaries at Verbum