A phrase which roots are the hebrew language. carries a very rough
mephistophelean/ironic fragrance.
It uses as a reply to a dumb/imaginary wish.
One may
add it his own 'punch'
bolting his uniqueness & individuality and also making the impact much bigger.
Example 1:
David: "Oh
simon, wouldnt it be great if we were able to fly?"
Simon: "Yeah...If my grandma had wheels..."
examles of a common expansion:
"If my grandma had wheels, she was a
motorcycle".