The act of ejaculating on the surface of one's sexual partner's anus and then observing it.
Guy1: "Hey, didn't you hang out with Girl1 last night?"
Guy2: "You know it! I totally gave her a Snow Donut! Girl2 would never let me do that..."
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When an old man scratches his head over another person's anus, sprinkling dandruff onto the outer rim, causing the appearance of a snowy donut.
"My Grandpa and Grandpa were having fun when I heard her begging for donut snow."