Explanation
-(이)랄까(요) hedges a description while the speaker searches for the right word: 'a kind of…', 'you could call it…', 'how should I put it'. It is the contraction of -(이)라고 할까 and attaches to a noun (친구 → 친구랄까, 사람 → 사람이랄까); after a verb or adjective stem the same contraction surfaces as -달까 (이상하다 → 이상하달까). It is casual and often trails off; add 요 for polite speech. 그냥 취미랄까요 — I guess you could call it a hobby.