She was acting like she was out of her gourd at the party.
Она вела себя так, как будто она была не в своем уме на вечеринке.
Definitions
This phrase means that someone is acting crazy, irrational, or out of their mind. 'Gourd' is a slang term for head, so being 'out of their gourd' suggests that a person is not thinking clearly or is behaving in a wild or nonsensical way.
