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2.
A large meeting of computer-enthusiasts held for the specific purpose of hacking a website or other technology.
My friends and I held a hackathon last night for the latest game system. Sorry to say, we couldn't find a way to hack its software.
by Technoliterature May 30, 2009
 
1.
Having company employees come in and work all night under the guise of innovation and opportunity with little or not reward to ones self for the sole purpose of benefiting the company.
Please join us in our hackathon next week we will provide pizza and beer in exchange for you burning yourself out.
by Corporate Whore March 14, 2011