Top Definition
One who masturbates while sleeping.
Robert: Why were you sleeping on the couch

Roy: Dude, your a Somn-onanist, it was nasty

Robert: NO WAY

Roy: Control yourself next time you have a fucking sleepover
#somn #onainist #masturbate #nasty #sex #dreams #sleepwalking
by Paige Stringer May 21, 2008
7 Words related to Somn-Onanist
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