καψούρα is a slang word, and it means: strong erotic passion, a burning desire for someone.
This is how it sounds (normal and slow tempo):
https://learn-greek-online.com/mp3/kapsoura.mp3
It comes from the verb "καίω"= to burn
(κάψα is a slang word for heat)
καψούρα is usually associated with an obsessive feeling, rejection or betrayal from the desired person, loss of self respect or self control, humiliation.
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.