EXCLUSIVE

Former Nine Inch Nails drummer Chris Vrenna is seriously pissed off over a new mash-up taking the Internet by storm (which mixes NIN's "Head Like a Hole" with "Call Me Maybe") ... because he thinks it's a total piece of crap.

The mash-up, "Call Me a Hole", went viral this week -- blending Carly Rae Jepsen's 2012 pop hit with the 1990 tune. It's been listened to more than one million times already and was hailed by the L.A. Times as "genius."

But not everyone is a fan. Chris -- who played with the band from 1989 to 1997 -- tells TMZ ... "Honestly I find the whole thing silly and partly offensive ... I find it kind of insulting."

He explains, "It has trivialized something we've done. I am proud of what we've done and to take art -- just to be a joke -- I don't have any respect for it."

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Chris makes it clear though ... he's not trashing Carly Rae or her music -- it was a third party who created the combo -- but believes the sound created by NIN shouldn't be messed with.