Done Need help understand a sentence

[kawaiiusagichan]

In the second panel, there's this line that says ああ…プロ…ぱねぇな
What does ぱねぇな mean? What kind of expression is it?

Here's the picture:

Spoiler

 

[cmertb]

パネェ is slang abbreviation for 半端じゃない.

 

[kawaiiusagichan]

Ooh, thanks!