Short for "Japanese rock."

see visual kei
Popular mainstream Japanese rock bands would be Glay, L'Arc~en~ciel, Dir en Grey, Malice Mizer and Kagrra.

Popular Japanese indie bands would be +D'espairsray+, Vidoll, Madeth Gray'll, Merry, and Aliene Ma'riage.
by Christina February 22, 2004
Japanese rock.

Broad term that encompases any rock music from Japan. Visual Kei is a subgenere of Japanese rock music, not an alternate name.
Mainstream bands: B'z, L'Arc~en~Ciel, GLAY
by Arachne June 4, 2005
jrock bands are: glay, dir en grey, malice mizer, x-japan,l'arc en ciel, and many more
by Anonymous August 2, 2003
(verb) the act of doing nothing while attempting to look busy.
Ie. Being assigned an audit, yet listening to music to appear busy.

Ie. "that guy is really pulling a jrock. One of these days they are gonna figure out that he doesn’t do a damn thing."
by Danskr March 6, 2007
Jrock is the short version for "Japanese rock", which includes Visual Kei, normal and alternative rock, but from Japanese bands. The term sometimes includes Japanese metal bands (such as Maximum the Hormone), but it's more rarely seen.
The most popular Jrock band in Japan is SID, but the GazettE has a lot of fans outside the country. They play Visual Kei and DOES plays normal rock in Japanese.
by Shirohime December 16, 2011