Cat Calls

That whoo-whoo noise. If you live in a city and are a reasonably well shaped woman you know what I'm talking about. Also apparently referred to as a wolf whistle.

I do not understand this phenomenon. According to urban dictionary:

When a guy gives the wert whirl whistle or yells at a babydoll for the purpose of getting attention and in hopes of a future hookup. This is usually done out of the window of a car. Typically a Pontiac Firebird, or Camaro. 99.9% a hookup never arises and it's just the thrill that keeps these going.

This definition is in interesting in its specificity, but accurate in my experience. This definition however...

Stereotypical whistle in which a male uses to convey his pleasure he has undergone simply from glimpsing upon an attract female visage. Usually leads to sexual intercourse.

-Caution-

DO NOT use on cats.

Ignoring the author's lack of knowledge of the English language, this post is redeemable based on the warning at the bottom. Really, if it wasn't for that comment I would have gagged on the grammar and run away. I doubt this person's grasp on reality though. Usually leads to sexual intercourse? Really now....

Why do people whistle at women like this though? Are they really expecting a "hookup?" Should I be flattered or worried for my safety? Also why does this occur so often when I'm biking? Are women on bikes sexy? Explanation please!