And the song contains some profanity. Something really bad. So much that it had to be marked just as an 'L'.
The 'L' in the song stands for, viewer discretion recommended here, laude, which is Hindi for penis, and is of course a slang. And 'lau*e lagna' is a slang meaning 'being damned/doomed'.
Now, since the censor board cannot pass the word in lyrics, the song has been made with a replacement, using just the first letter of the word. As such, the song is quite a wannabe, and looks like a copy of Kolaveri di in more than one ways.