1. The emotion a bro feels when he spends too much time without other bros.
2. When a bro gets dissed by his bro-ho and he's all solo.
Biff: <calls Todd> Hey bro, I'm at this party in the OC and I'm like, the only guy here in a Famous Stars and Straps shirt and a lifted truck. I feel so bronely!
Todd: Ah brah, man...that sucks! You should come back to the 909 and hang with the Skin Industries crew!
Buffy: <calls Biff> Biff, I found a better bro with a higher lift on his bro-6 F-150. I'm leaving you for him.
Biff: WHAAAAT? You can't leave me Buffy, I'll be bronely!
When you are without any bros, and you are only hanging out with the opposite sex. Therefore making you lonely and distant of any bros.
Peter- Look at that kid, he only hangs out with girls
John- Hes either just gay or really bronely