a. slang. [Of fanciful formation.] Intoxicated; drunk.
1874. Slang Dict., 307. Squiffy, slightly inebriated.
1884. Mrs. C. Praed, Zéro, viii. At night she is generally a little squiffy.
1894. G. W. Appleton, Co-Respondent, ii. 42. Youre a bit squiffy, arent you, Dick? No, Im as sober as a waterspout.