κουραφέξαλα is an informal (colloquial) Greek word and it means "nonsense"
Example:
Τι σου είπε; = What did he tell you?
Τιποτα σημαντικό. Κουραφέξαλα! = Nothing important. Nonsense!
κουραφέξαλα probably comes from the word κουφόξυλα = hollow woods (empty, without content)
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.