When two people in a non sexual way live, breath, talk, text, think, etc. each other 24 hours a day, 7 days a week, and NOTHING gets in the way of it. Methods such as Facebook, Youtube, Cell Phones, Videos, Landlines, etc are used as a form of keeping in touch 24/7.
Steve is always 24/7 bromancing Jay at all hours of the day no matter where he is at, no matter what he is doing. While Steve is having sex with his wife, he stops in the middle of it and texts Jay about something, then continues the deed. This is the purest form of 24/7 Bromance.