His mouth shot him in the foot

A commentator was talking about a politician who undermines himself by saying inopportune things. This appears to be a mashup of “put (one’s) foot in (one’s) mouth” (to unintentionally say something foolish) and “shoot (oneself) in the foot” (damage or impede one’s own plans). Foot and mouth disease might have been on the speaker’s mind. Who knows? Other idioms possibly contributing are “run off at the mouth” (talk too much), “mouth off” (speak without discretion) and “run (one’s) mouth” (talk too much). For some reason, this malaphor reminds me of the classic one uttered by Ann Richards at the 1988 Democratic Convention, when she referred to George H.W. Bush  as someone who was “born with a silver foot in his mouth”. A big thanks to Verbatim for hearing this one and passing it on.