When a person sneezes and or blows their nose directly in to a guy's balls and he then smears it across the person's face. Often before or during a blowjob.
Chantelle: I have a nasty cold and no kleenex

J: Come here and let me snotball you
by Chadpants October 23, 2013
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A ball made of snot. Usually rolled between the fingers until a spherical shape.
Rick picked his nose and rolled a snotball to throw at Misty.
by April December 8, 2003
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