Full neilson

When a males penis us at its largest, from an having an erection it is called a full neilson
It was aukward because I had a full neilson when I stood up.
by Toumbraider99 June 29, 2018
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Half neilson

When someone has a half boner
She was hot, but she only gave me a half Neilson
by Toumbraider99 June 29, 2018
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