What are “Props”?

What exactly is a ‘blip’?
A blip is a combination of 2 things:
1) a song
2) a short message that accompanies it.
The way you create a blip is to first search for a song that you want to hear (or a song that you want your listeners to hear), then add a short message (under 150 characters), finally you submit it. Submitting a blip is also referred to as “blipping”, so from here on out, when you read “he blipped my favorite track” it means “he submitted a blip that had my favorite song attached.”

— Blip.fm