Originally Posted by
kiwiandrew
OK , I figure that this must stand for "Your ?????? May Vary" , but I have never been able to figure out what the first 'M' stands for - please help me out and in exchange I will promise to keep an open mind with regard to IB .
Others have provided you the answer but you can also check the Flyertalk Glossary when you see an unfamiliar term.
http://www.flyertalk.com/glossary/?letter_start=Y