Top Definition
Busting an extremely large cum load usually occurring when one masturbates for the first time after a long hiatus of not masturbating.
For lent I did not masturbate for 40 days. When I masturbated for the first time, I did Robust a nut.

I would like to very much robust a nut on 6 - 8 girls in my math class.
by BigHorseAl April 15, 2009
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