"Alison" is a bittersweet ballad written by Elvis Costello. The singer articulates his feelings towards Alison, presumably a former lover, who has just got married. Though the music is sweet and tender, the words are harsh and biting. He insists (and repeats) throughout that his "aim is true" (which gave title to his 1977 album), suggesting that, though he is conveying anger, he means well. Or perhaps he offers his "aim" to "put out the big light".
Oh, it's so funny to be seeing you after so long, girl
And with the way you look, I understand that you were not impressed
But I heard you let that little friend of mine
Take off your party dress