The moment when a rocket experiences the most intense atmospheric forces during launch.
The moment when a cosmonaut has received confirmation from ground control, and inserts his rocket into space.
A euphemism for the moment of insertion.
"Falcon heavy passed max Q on its trajectory to mars without experiencing rapid unscheduled disassembly."
Elon to a honey:"I took a viagra 20 minutes ago, I expect to reach max q at t+30"