Upperclassmen

[glatt]

Originally Posted by Sundae Girl

I'm sure that's very clever and all.
I just didn't understand a word of it

It's some lyrics from a famous song in the States. It's about the excitement of two people engaged in foreplay about to enter into actual intercourse. It uses the euphemism of making it to home plate in baseball and scoring, and is told from the point of view of a young man.

edit: what Pie said. Also, it's a favorite at wedding receptions.