When a man/woman is usually on their hands and knees(doggy style) or sometimes standing up, and they get a big hard cock up their ass. Some women like it, and some women can't stand the pain. The reason some people like it is because they like the feeling of having a cock in the back. And guys like it because it's tight, and can sometimes feel better than vaginal sex.
1: My boyfriend pounded my tight ass last night! His cock was so big, and it felt so fricken good!
2: Kyle sat on Caleb's d*ck and slowly went up and down.
3: Carol got on her hands and knees and begged her boyfriend for anal sex.
4: Gabe loves giving his girlfriend anal, because he loves pounding her tight as* with his huge hard cock.