(someone) be a nutcase

Translations
(кто-то) быть чокнутым
He can be such a nutcase sometimes.
Иногда он может быть таким чокнутым.
Definitions
To say that someone is a 'nutcase' means to describe them as crazy, eccentric, or behaving in a very strange or irrational way. It is an informal and sometimes offensive term used to suggest that a person is mentally unstable or acting wildly.
Words
someone

pronoun
кто-то
be

verb
быть
a

article or possessive pronoun
один
nutcase

noun
псих