The title of this song ('Three Point One Four') is a play of words.
Three point one four (3.14) is the value of Pi (π), which when pronounced in english sounds like "pie".
"Pie" is sometimes used when referencing to the female genitalia.
My last girlfriend didn't like me, thought she might be
Most likely a dyke, she just didn't excite me
Lefty, yeah, but that was alright
She was hotter than the sun but she just wasn't that bright