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1.
An intense orgasm caused by the removal of Comcast service and going with another company that doesn't suck ass.
Dude, when I returned my Comcast cable box today I totally had a comcasm.
by jrholmes October 14, 2011
 
2.
An intense, lengthy period of incompetence. Stemming from Comcast Cable Corp.'s awesome ability to blow balls and have 15-20% downtime. Comcast offers a shitty service that works at it's advertised speed around 30-40% of the time, despite their recent price increases. Fuck Comcast.
"Dude my modem had a Comcasm and my internet was out for 3 days."
by comcastblows April 22, 2007