What is a popper?

It's either amyl nitrate or butyl nitrate in a glass ampule that you break (pop) open to release the vapors which you inhale to give you a massive rush from intense vasodillation throughout the body. Some fags use it to help relax the anal sphhincter to ease insertion of large objects.

It makes my ass relax so I can take big cock in it.
Mike P.

Yes, Google can explain it