'Testiest' definitions:

Definition of 'Testiest'

From: GCIDE

Testy \Tes"ty\, a. [Compar. Testier; superl. Testiest.] [OF. testu obstinate, headstrong, F. t[^e]tu, fr. OF. teste the head, F. t[^e]te. See Test a cupel.] Fretful; peevish; petulant; easily irritated. [1913 Webster]
Must I observe you? must I stand and crouch Under your testy humor? --Shak. [1913 Webster]
I was displeased with myself; I was testy. --Latimer. [1913 Webster]