Unpurpose
Business Term (Verb): To undermine the utility of a business meeting through participation, or to extinguish the meaning and impact of a presentation or letter by editing it or adding his own unsolicited thoughts.
Thanks to some stupid fucker inviting him, Kevin was able unpurpose the meeting in about five minutes
unpurposely
When something is not on purpose
"Omg! It was unpurposely that I said that thing!"