Hightlight first and last 2 lines after column 80:

    :autocmd VimEnter,WinEnter * :match Error /\v%>80v%<3l.*|%>80v.*%$|%>80v.*(\n.*%$)@=/

**Explanation**:

 - `%>80v%<3l.*`  match everything after column 80 in first 2 lines
 - `%>80v.*%$`    match everything after column 80 in last line
 - `%>80v.*(\n.*%$)@=/` match everything after column 80 in last second line
 - :help :match
 - :help /\%v
 - :help /\%l