Definitions by The Harvard Dictionary

IBM 

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."

IBM by The Harvard Dictionary July 21, 2015