Usually a response to a question used to describe how something or someone is.
When something is great, good, okay, fine.

A term used after sex when you've slapped your girlfriend on the ass so hard it leaves the area super red it looked like it's been whipped by a paddle.

Slapping your significant other hard enough that it looks like paddle whips on her behind.

Risky and experimental lovemaking technique particularly used by couples working in the medical profession.
Partner one, mid-intercourse, administers an alternating current from a 300 or greater volt source to the sides of partner two's unexposed heart using paddle' electrodes. All being well, partner two's heart stops and intercourse continues for as long as is dared before partner one uses the paddle electrodes to bring partner two back from the afterlife. For a heart paddling session to be successful both parties must survive.

an observed condition when fat people turn hands sideways when walking in a vain attempt to gain more momentum using hands like paddles

A Paddle Wanker refers to a minority of people who cannot bend their fingers back, thus emulating the shape of a paddle. They are complete wankers, who contribute next to nothing to society. They attempt to destroy as many oars/paddles as they can find, in order to justify their existence.

Like Motor boating but with the ass.

Mean's that a guy, i.e. a caucasian male who looks so hott, that he is worthy of a spanking with a big rubber paddle.