Graffiti, which also serves as the plural of graffito, is commonly used as a singular mass noun.
graffiti … was depressing people who rode the subways
—
New Yorker
graffiti comes in various styles
—
S. K. Oberbeck
This use is well established although not yet as well established as the mass-noun use of data. Use of graffiti as a singular count noun is still quite rare and is not standard.
graffitied; graffitiing
grə-ˈfē-(ˌ)tē-iŋ
gra-,
grä-
also graffiting
grə-ˈfē-tiŋ gra-,
grä-
: to draw graffiti on : to deface with graffiti
graffitied walls
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Merriam-Webster unabridged
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