Someone already mentioned Michael Jackson's "Beat it", but let's not forget about Weird Al Yankovic's " Eat it in my pants.
And some more.
The Beatles:
Girl in my pants
Blackbird in my pants
Rubber soul in my pants
Here comes the sun in my pants
I saw her standing there in my pants
I am the walrus in my pants
Ticket to ride in my pants
Something in my pants
George Harrison:
While my guitar gently weeps in my pants (I swear it's not pee!!)
Stevie Wonder:
Superstition in my pants
I just called to say I love you in my pants
Daft Punk:
Lose yourself to dance in my pants
The Rolling Stones:
Satisfaction in my pants
Paint it black in my pants. (Rachel?)
The spider and the fly in my pants
Beyoncé:
Single Ladies ( put a ring on it in my pants)
Britney Spears:
Oops, I did it again in my pants. (I knew guitars don't really weep!)
Gloria Gaynor:
I am what I am in my pants
Los Shakers:
Break it all in my pants
The Doors:
Light my fire in my pants
MC Hammer:
Can't touch this in my pants
Technotronic:
Pump up the jam in my pants
Deerhoof:
Panda in my pants
Traditional:
This train is bound for glory in my pants (also known as "This train in my pants")
Peete Seeger:
If I had a hammer in my pants
Where have all the flowers gone? In my pants.
Malvina Reynolds:
Little Boxes in my pants
Undetermined author:
We shall overcome in my pants
Five foot two in my pants ( Dr Chett, looks like you have some work to do here, and I can share!)