In British Movie "Pirate Radio", There is scene where Elanore broke with Simon because Elanore fallen love with Gavin & Simon sit with crew members discuss his feelings with them.
Simon: Can you tell me one thing? Before she left this morning, did you. . . You didn't. . .You know?
Gavin: Just one little pop.
What does "one little pop" means here?
It probably means a kiss.
It's been a while since I've seen that movie. But judging by the context you've given and my memory, I think Simon is asking Gavin if anything romantic (and probably physical) happened between him and Elenore that morning. But he's too embarrassed to ask directly, and then Gavin responds in slang. I think it means "just one little kiss".
It could mean more than that (more passionate, more physical, whatever), but it would depend on more of the context. Do we see the moment before Elenore leaves in the movie and know that she kissed Gavin? Or are we taking Gavin's word for it? He could be using slang to be vague or because he is lying, or to spare Simon's feelings. A lot of things are possible depending on how the moment works in the movie.
But I think it probably means a kiss.
