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Someone who does something truly pathetic, or sad.
"I spent all weekend alphabetizing my 8-Track collection."
"You're such a sadnut."
by M.C. Brown Shoes December 11, 2004
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When you here something or see something saddening and proceed to ejaculation.
I was jacking off in the bathroom when I heard my parents say I was a disappointment, that was the worst Sad Nut of my life.
by Dukelemon August 19, 2017
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