masturbation over the open mouth of one's sleeping romantic partner.
My woman fell asleep early last night, leaving me frustrated and triggering a manvalanche.
by maupin August 30, 2012
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an abrupt and uncontrolled falling of a very large man
After almost falling out of bed, my husband proclaimed, "Wow! That was almost a manvalanche!"
by adc11 October 5, 2008
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