To speak through the nose; to breathe through the nose when it is obstructed, so as to make a broken sound. One clad in purple eats, and recites some lamentable rhyme . . . Snuffling at nose, and croaking in his throat. (Dryden)
Origin: Freq. Of snuff, v.i.; akin to LG. Snuffeln, G. Schnuffeln, D. Snuffeln, Dan. Snovle. Cf. Sniffle.