A fullo was a Roman fuller or laundry worker, known from many inscriptions from Italy and the western half of the Roman Empire and references in Latin literature, e.g. by Plautus, Martialis and Pliny
Mural painting from fullonica VI 8, 20.21.2 at Pompeii, now in the National museum of Naples.
In archaeological terms, graffiti are marks, images or writing scratched or engraved into a surface. There have been numerous examples found on sites of the Roman Empire, including taverns and houses,
Fullo
…Minerva’s main feast held on March 19. The feast often took place in a fullo's workshops. Fullones are associated with representations of owls, such as in Roman graffiti found in Pompeii. There has been a lively scholarly debate whether the association is due to the owl of Minerva or due to Varro's proverbial phrase…
Fragment of a plaster wall from a dwelling inscribed with graffiti including the goddess Diana and a stag. Image shows the graffiti, dating from the 2nd century to AD 275, on display in the Roman Museum at Augusta Raurica
Sample of poetry from stairwell of House of Maius Castricius, Pompeii
Three inscriptions referring to the opening line of the Aeneid