A bee in layman's terms comes from the movie,
X-Files: Fight the Future. The scene when this comes into play is when
Mulder and Scully try to kiss -- and a dang bee comes and stings her and they end up NOT kissing.
Another example is when Tony and
Ziva try to kiss in a room and someone opens the door. This is another example of a bee, only this time only a figurative bee, not a literal one.