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1.
abbreviation for "make-out session". quality time spent in the batter's box and at first base.
-longer than just a quick kiss - at least five minutes of dedicated snogging.
-always involves horizontality
Sorry, I missed the last inning due to a superb make-out sesh with Dustin.
by mrs. khalil greene July 14, 2008
 
2.
Short for make out session. Refers to a long period of making out. To be considered a session, it should probably be at least 15 minutes long. A session is usually not random or spontaneous but can be in some cases.
Q:What did you and Jamie do last night?
A:We had a make out sesh.
by mvwaterboy September 07, 2008