"Hardcore users" refers to individuals who are extremely dedicated or committed to a particular activity, product, or service. They often possess deep knowledge or expertise in the subject and actively engage or use it frequently. Full definition
With some greasy fingers, I really doubt it'll last in time, especially for hardcore users who want to use this device for working 8 hours a day. (news.softpedia.com)
He understands that some of the more hardcore users in the community have been testing and pointing out comparisons between 4 GB and 6 GB phone models. (pocketnow.com)
Then again, I'm probably not as hardcore a user as most readers on this site. (tmonews.com)