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1.
The impending act of physically beating a person until they can no longer stand.

Origin: Irish
Stand back, there's about to be some molly wopping going on up in here!
by badgirl1 August 04, 2010
 
2.
An act of violence on whites perpetrated by blacks.
There was a race riot with all kinda of mollywopping goin on.
by borkz May 08, 2011