एक लड़की को देखा तो ऐसा लगा ...

You can find Meanings and English transliteration on the web. The song is from the movie 1942: A Love Story. Most of the material in this blog post comes from that URL.

The poet — lyricist Javed Akhtar — describes how a boy feels when he sees a girl [for the first time]: many different ways in which the feelings are expressed, 21 ways to be exact, in 3 stanzas of 7 characterizations each. The song can be translated as

When I saw this girl, she seemed to me like ...
... a blooming rose,
... a poet's dream,
...

Now, enjoy the video as your read the lyrics presented below.

अगर तुम न होते

कुछ न कहों कुछ भी न कहों

प्यार माँगा है तुम्हीसे न इनकार करो

यह मेरा दीवानापन ...