1 definition by Epa Epar

The act, or more aptly; The rather unfortunate act of reaching climax at the exact moment a plane comes crashing through your roof. For this act to be properly performed, your family* must be in the next room when the plane reduces your masturbating ass to charred dust.

*Your family obviously excludes your sister. Who should be at my house working on taming her gag reflex.
"Did you hear about that guy who had a Planegasm? His sister gives GREAT head now!"

"So your whole family was across the room when she came? I'm so sorry to hear that..."
by Epa Epar August 24, 2011
Get the Planegasm mug.