\makeatletter
\AtBeginDocument{%
  \@ifpackageloaded{amsmath}{
    \def\bBigg@#1#2{%
      {\@mathmeasure\z@{\nulldelimiterspace\z@}%
        {\delimiterfactor=1000\relax \left#2\vcenter to#1\big@size{}\right.}%
        \box\z@}}}{
\PackageError{master}{Are you kidding, you're not using amsmath?!}{}
}}
\makeatother