Top Definition
Married men know Murphy's Load well. Murphy's Load refers to the times when you've secretly masturbated and for an inexplicable reason, within hours, your wife is all over you, despite a huge dry spell leading up to jerking off.
"I jerked off because I couldn't take it anymore and suddenly she was all over me. This is known as Murphy's Load."
by Foobie April 14, 2004

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