Adjective: Describes a Jeckyll and Hyde like character - a person who is apt to change from a good person to an evil person (combination of benevolent and malevolent).

Dr Jeckyll is manevolent, as he shifts quickly from caring doctor to evil and violent murderer Mr Hyde.
Mary-Lou can be lovely and kind one minute and spitefully vindictive the next - she is such a manevolent cow.

'Jack the manevolent nurse was happy by day caring for his helpless patients while all the while plotting how he could overdose them with morphine when the lights went out'

Manevolent by LouLou333 April 5, 2010

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manvalanche

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.

manvalanche by maupin August 30, 2012

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Marneval

1. A person that is really possesive over cakes, pies, and pastries.
2. To mindlessly devour cakes, pies, and pastries twenty four hours a day, seven days a week, without sleep, until end of life.

Ah, man, dat nigga'z stomack be all jello an' bouncin' jus' like 'e been Marnevallin' all up in dis 'ere shit right now, niggah!

Marneval by mjthompson April 6, 2004

manvalanche

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!"

manvalanche by adc11 January 17, 2009

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