Fastfood rhymes with:
megafood, seafood, alamoud, altitude, amplitude, aptitude, attitude, barbecued, barbequed, certitude, countersued, d'etude, devalued, dulude, ensrud, exactitude, fortitude, gratitude, ineptitude, interlude, interviewed, latitude, lindamood, longitude, magnitude, megafood, multitude, platitude, prelude, previewed, rectitude, seafood, servitude, solicitude, solitude, turpitude, unissued, verisimilitude