Graffito
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The singular form of 'graffiti,' from the Italian, referring to a single inscription or drawing on a wall. Frasier's use of the precise singular form is itself a display of erudition.
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Mentioned once in Love Stinks.
Love Stinks
Season 9 · Episode 5 · S09E05
“I discovered an injurious graffito about me. Scrawled on the men's room wall.”