think all one's Christmases have come at once

think all one's Christmases have come at once (third-person singular simple present thinks all one's Christmases have come at once, present participle thinking all one's Christmases have come at once, simple past and past participle thought all one's Christmases have come at once)

1. (informal) To be delighted with one's good fortune.

• Christmas comes early
• like a kid at Christmas