The art of surprising your loved one by randomly telling them that you love them.. need them... miss them. Often said in the middle of conversations that are totally unrelated.
Lover 1 - So I went to the beach today...
Lover 2 - Oh god I Love you!
Lover 1 - Aw wow!! What was that for?
Lover 2 - Just.... Spontaneous Affection! ... I really missed you today..