To be insane, crazy, or senseless.
If you discuss
something that is taboo, then you might be meshuga.
If a person acts
in a way that senseless, he or she might be a meshuga.
Yiddish roots
The hysterical
executive responded, "are you meshuga? Ask me about
anything else... but please, not about THAT"
Mendel: Come on Heschel, schlepp on over to the butcher!
Heschel: Mendel, are you meshuga? that place isnt kosher!
Ruva: It doesnt matter, neither of you two are
straight up jew.