When one visits a store or mall to admire goods rather than to purchase them. The 'shopper' seems to be looking so intently at the glass in storefront windows that he appears to want to buy the window itself, hence 'window shopping'.

When a man or woman in a relationship flirts with someone else, with no intention of taking it any further than that. It's like looking at a brand new 50" HDTV without the intention of buying it, even though it's still nice to imagine having sex with it.

1. browsing shops without intending to buy anything that time.

2. actually shopping for new windows

3. watching the prostitutes in the red light district

When a person stares at the ass or genitals of another person without actually touching them.

when you go around the mall looking through store windows and you stare at things but you don't actually buy stuff.

1. Looking at products you do not intend to buy
2. A person who is involved with a signifigant other causually admiring another person's body.

looking/staring at someone you want so so bad but you know you can't have/get for some reason.