From Wiktionary, the free dictionary
Literally, “have you eaten soap or have you gone crazy [without soap]?”.
- IPA(key): [tɨ ˈmɨɫə jeɫ ˈilʲɪ taɡ zdʊˈrʲeɫ]
ты мы́ло ел и́ли так сдуре́л? • (ty mýlo jel íli tak sdurél?)
- (folk, colloquial) a comment on a person's stupid act