Extemporize

v. i.	1.	To speak extempore; especially, to discourse without special preparation; to make an offhand address. [imp. & p. p. Extemporized; p. pr. & vb. n. Extemporizing.]
v. t.	1.	To do, make, or utter extempore or off-hand; to prepare in great haste, under urgent necessity, or with scanty or unsuitable materials; as, to extemporize a dinner, a costume, etc. Themistocles . . . was of all men the best able to extemporize the right thing to be done. - Jowett (Thucyd. ). Pitt, of whom it was said that he could extemporize a Queen's speech - Lord Campbell.

Verb	1.	extemporize - manage in a makeshift way; do with whatever is at hand; "after the hurricane destroyed our house, we had to improvise for weeks" Synonyms: improvise
	2.	extemporize - perform without preparation; "he extemporized a speech at the wedding" Synonyms: ad-lib, extemporise, improvise, improvize

ad-lib, be caught napping, be surprised, be taken unawares, be unprepared, cook up, dash off, do offhand, fake, go off half-cocked, have no plan, improvisate, jury-rig, knock off, lash up, make up, play by ear, scrap the plan, strike off, throw off, throw together, toss off, toss out, vamp, whip up, whomp up, wing it