mid cock

When a person (generally a male) is beating guts or self beating and he knows his about to nut within the next minute per the stimuli on the tip of shaft but then gets rudely interrupted by an uninvited variable.

John: I was destroying this street puppet knowing I’m about to bust within the next few traffic lights when my ex thottie decides to show up mid cock because she found me live-streaming this event on the gram.
Jake: Sir, you need to leave. This is a Wendy’s.