Source : Webster's Revised Unabridged Dictionary (1913)

Liripoop \Lir"i*poop\ (l[i^]r"[i^]*p[=oo]p), n. [OF. liripipion,
   liripion, LL. liripipium. Said to be corrupted from L. cleri
   ephippium, lit., the clergy's caparison.]
   1. A pendent part of the old clerical tippet; afterwards, a
      tippet; a scarf; -- worn also by doctors, learned men,
      etc. [Obs.]

   2. Acuteness; smartness; also, a smart trick or stratagem.
      [Obs.] --Stanihurst.

   3. A silly person. [Obs.]

            A liripoop, vel lerripoop, a silly, empty creature;
            an old dotard.                        --Milles. MS.
                                                  Devon Gloss.