Tufbrew

Tufbrew is a cut perk-a-cola that was going to appear in Ascension. The only proof that it exists are in the character sound files with 'perk_tufbrew' in the name. Dempsey's sound file is the only one that mentions the perk by name. One possible theory for this perk's function is that it reduced player flinching when hit, similar to Hardened Pro.

The character quotes can be heard here