#Zingfail
Phonetically: Pounce Zing Fail. A smartass, clever comment that misses its mark.
From Talkingpointsmemo.com:

#ZINGFAIL
It really shows how deep we are in the bamboozlement when even the bamboozlers get tripped up in the nonsense.

Here's CNBC's Maria Bartiromo asking 44-year old Rep. Anthony Weiner: "If Medicare's so good, why aren't you on it?!"