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It refers to Darren Criss, who plays a gay man on television and when interviewing in real life he ALWAYS makes a point to say that he is straight and point out his heterosexuality. therefore Crissing is an insistent declaration of one's heterosexuality
Interviewer: Are you ok?
Darren Criss: Yes, I'm straight and I have a girlfriend.

That's is Crissing
by indigoGirl81 May 18, 2011
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