Global blocks don't affect Meta-Wiki, so if your IP address is blocked, you can still appeal here. IP addresses that cause disruption on Meta should be reported at Meta:Requests for help from a sysop or bureaucrat instead of here so that they can be blocked locally.
Please describe the kind of cross wiki abusive activity you see from the IP. Saying an IP is a long term abuser is not helpful, but saying "IP vandalizes at ban.wikipedia, no.wikipedia and vi.wikipedia" is. This is especially important for range blocks. If you do not provide enough details, your request might be declined.