Meaning

noun the tangible substance that goes into the makeup of a physical object

noun miscellaneous unspecified objects

noun informal terms for personal possessions

originFrom Middle English stuf, stuffe, from Anglo-Latin stuffa and its etymon Old French estofe, estoffe, estuf, estuffe, stoffe, from estoffer, estofer (“to provide what is necessary, equip, stuff”), borrowed from Old High German stoffōn, from Proto-West Germanic *stoppōn (“to clog up, block, fill”). More at stop.

Etymology from Wiktionary, CC BY-SA 3.0