1 definition by The Harvard Dictionary
An IBM is an International Bowel Movement is the act of farting as you cross over boards to another country. It can also include the act of "pitching a loaf" while crossing boarders in a plan.
1) "Alan's IBM lasted 5 seconds as we crossed into France."
2) "I almost took down the plane with that IBM."
2) "I almost took down the plane with that IBM."
by The Harvard Dictionary July 6, 2015