Pumping. Normal? Weird? Advice please.?!

Your description is vague, so I'm not sure. I'll just answer in a general way.
The skin in our anus and rectum is delicate and sensitive. All the nerve endings are very responsive, so it can feel sexy to touch ourselves there. Since the skin is delicate, we have to be careful how we treat it.
Before you slide anything into your anus, make sure it's completely clean. Dirt from outside can irritate the tissues and may lead to infection. Also make sure it's very smooth. A rough edge can scratch the tissue, and then dirt or bacteria from inside or outside could cause irritation and possible infection. Also make sure it's very well lubricated with something mild and gentle. Avoid soap and petroleum products, they can irritate. Anything you could eat and doesn't contain spices or strong acids should be safe. There are also products specifically for lubrication, like KY jelly or Astroglide. Make sure whatever you're putting in your rectum has a handle so it won't slip out of your grip and get lost behind your sphincter. This can lead to an embarrassing trip to the ER.
Regarding "pumping". Gently stroking your appliance in and out, with plenty of lubrication, should be safe. You should be able to accommodate something as big in diameter as three of your fingers together, or maybe a teensy bit larger if you want. Maximum length should be about 6 or 7 inches. Any longer might start bumping into the Valve of Hansen or a curve in your rectum. If this device is creating any kind of suction or going through some mechanical motion, I would say don't use it, because it could bruise or tear the delicate skin in your anus and rectum.

Stimulating your anus and rectum for sexual pleasure is not weird. Lots of guys enjoy this type of stimulation. It's safe as long as you're careful with the delicate parts.

You are about to blow your brain out either that or you are gay