verb, transitive. To slap another's face with one's penis. Usually said in response to an insult or other cutting remark directed at the speaker.

noun. A slap to the face with the penis.

Note: A molly whop works best when accompanied by the insinuation that the "whopper" has a particularly large penis. This can be accomplished by adding a qualifier after the phrase, or by prior knowledge of the "whoppee" of the "whopper"'s enormous penis.
verb form:
Jane: Can we please go to the mall today?
John: Jane, so help me god, if you ask me that one more time I'll molly whop ya!

noun form:
Jack: So I heard you and Jane had a fight the other day. What was all that about?
John: Well, she was being a bitch, so I gave her a good ol'-fashioned molly whop with my burgeoning man-meat.
Jack: Ha ha! That'll teach her!
by Rob N February 22, 2006
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To punch someone so hard it lifts them off there feet; usually ending in a KO.
You see joey fuckin molly whopped that nigga? Lifted him right out of his nikes, then we fuckin stole em.
by STERLIN!!! October 26, 2008
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When a grown man drops his trousers and a male and or female is being roudy and annoying. The man shows dominance by smacking the individual in the face with his Smoked Meat Log.
The woman wouldn't leave me alone, so I dropped my pants and Molly Whopped her.
by SnappinBedposts September 12, 2014
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When playing the game Gears of War, wielding a fast killing weapon of your choice, and killing an enemy so fast that they didn't know what the fuck happened.
1. Oooh shit. Get Molly-Whopped!

2. This dude tried to 2-piece me. OH HELL NAW get Molly-Whopped bitch!
by iMR POPZALOT September 2, 2009
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To stike or hit something such as a ball, really good and hard right on the sweet spot!
For example, a guy hits a three hundred yard drive and his buddy says:

"Dude you molly whoped that one!"
by thenid September 6, 2006
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1. to utterly destroy someone or something
2. to beat someones ass
we just molly whopped their donkey business 3-0 in soccer
by sg-t September 8, 2008
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