A brief, quick session of having sex.
Quick sesh with Steve
A brief period of gathering or congregation between people. A term commonly used by skaters, which has been made famous by the number one Guitar Hero player in the United States, James Coulter.
Any noun or verb may be placed between quick and sesh, such as "quick skate sesh."
Omg man, we gotta have a quick sesh later today to discuss the latest Raining Blood FC!