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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!
de badgirl1 4 août 2010
 
2.
An act of violence on whites perpetrated by blacks.
There was a race riot with all kinda of mollywopping goin on.
de borkz 8 mai 2011