Green’s Dictionary of Slang

(US campus) of a person, emotionally chilly, very distant.

1989		P. Munro Sl. U. 22: arctic [...] mean, cold (of a person).
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 arctic adj. To be in vast emptiness, loneliness or void, referring to emotions. ‘After the death of my dog I felt completely arctic.’.