Russian avos'
(Russian: авось) describes a philosophy of behavior, or attitude, of a person who ignores possible problems or hassles and, at the same time, expects or hopes for no negative results or consequences. It is an attitude that treats life as unpredictable and holds that the best one can do is count on luck.
1: "Did you study for the test? You finished it suspiciously quickly."
2: "I couldn't bother studying, just answered everything by Russian avos'."
2: "I couldn't bother studying, just answered everything by Russian avos'."