Elena Bogomolovaadded a comment 5 years ago
Это есть в словарях. Используется для усиления, подчеркивания.
Н-р, Collins Dictionary.
14. adverb [ADVERB with verb, noun ADVERB]
If you talk about something that happened back in the past or several years back, you are emphasizing that it happened quite a long time ago.