This is the 4591st most frequent German word.
slowakische
"Slowakische" means "Slovak" in English, relating to Slovakia or its people/language.
Here, 'slowakische' is used as an adjective to describe the language associated with Slovakia: the Slovak language.
Die slowakische Sprache wird in der Slowakei gesprochen.
The Slovak language is spoken in Slovakia.
In this case, 'slowakische' is used as an adjective to describe the nationality of the friend, indicating that she is from Slovakia.
Ich habe eine slowakische Freundin, die sehr gut Deutsch spricht.
I have a Slovak friend who speaks German very well.
Here, 'slowakische' describes the origin of the dishes, meaning they are traditional or typical in Slovakia.