The Collaborative International Dictionary of English v.0.48:
Peaky \Peak"y\ (p[=e]k"[y^]), a. 1. Having a peak or peaks. --Tennyson. [1913 Webster] 2. Sickly; peaked. [Colloq.] [1913 Webster]WordNet (r) 3.0 (2006):
peaky adj 1: having or as if having especially high-pitched spots; "absence of peaky highs and beefed-up bass" [syn: peaky, spiky]