have a jag on

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have a jag on (third-person singular simple present has a jag on, present participle having a jag on, simple past and past participle had a jag on)

1. (idiomatic, intransitive) To be drunk.
   • 1896, Bret Harte, “A Yellow Dog,”, in Selected Stories‎:

     "The old man must have an awful jag on today," was casually remarked when an extra fluffiness and imbecility was noticeable in the passing Bones.

   • 1930 April 14, Time:

     […] Wilfred John Funk, who whiles away his time writing jingles […] sometimes pretends to be a drinking man. A Funk jingle published last week: Myra, if I have a jag on / I am apt to hitch my wagon / To a street light on occasion.