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1.
An unexpected and undesirable event combined with the result or effect that is intended or desired.
After only 10 minutes of sultry sex with the mysterious woman in the bathroom, I ejaculated by accipurpose.

As the inebriated woman slipped off her bar stool, I grabbed her breast to shield her fall by accipurpose.
by Eric Bull August 19, 2004
 
2.
a fusion of 'by accident' and 'on purpose' meaning to accidently do something on purpose. To acknowledge that ones actions were deliberate whilst at the same time claiming there was an unintentional component – in other words a feeble plea of mitigation.
typically in defense of ones actions "I did it on accipurpose"
by crazypartygirl July 03, 2011