This is the 7375th most frequent Russian word.
глусская
It seems "глусская" was mistyped or miswritten. If you meant "русская," it translates to "Russian" (feminine form).
Here, 'глусская' is used as an adjective describing a person (a woman) from the town of Glusk, showing origin.
Моя подруга из Глусска, и она глусская.
My friend is from Glusk, and she is from Glusk.
'глусские' in this context modifies the plural noun 'традиции,' indicating that these traditions are associated with Glusk.
Я люблю глусские традиции, они такие интересные!
I love Glusk traditions, they are so interesting!
In this sentence, 'глусские' refers to the style or origin of the dishes, associating them with the town or region of Glusk.