I used to not like to shit at school or in a public place and I would try to wait until I got home. One time I was taking laxatives to help me loose weight and to better time my poops but that caused me once to almost shit myself badly. I was riding the bus home and I had bad cramps that felt like gas. I thought I could just lift my butt and fart but when I did some diarhea came out. I was afraid when I got up I there would be a stain through my skirt or it would run down my leg. So I discretly moved my right hand up my short skirt and under my butt to and luckly my panties and hose were dry thanks to the fact that I was on my period and wearing a sanitary pad. As the ride progressed I had a greater and greater urge to poop. Finally I was clinching my butt together with all my might trying not to show it on my face. Finally my stop came and as I was leaving the bus I was sure people could tell my butt was tightened and I tryed to relax a little. As I walked away I got such a sudden spasm that I had cross my legs and bend over to regain control. Then I realized that my short skirt was probably riding up in the back so I straightened up and kept walking. After about 100 feet I got another spasm and pain in my abdomin so much that splinter opened up uncontrolably and this semiliquid shit came out into my panties, and into my pantyhose between my legs. No one was around except for cars so I don't think anyone knew. I stepped into the woods and as I was so stunned I just stood there. There was nothing I could do but walk home like that and take a shower. Luckily, my skirt was intact and I encountered no one. It is hard to walk normaly in such a state. So I learned my lesson about laxitives and stopped taking them. But my system was so used to them and I from holding myself rather than using the tiolet at school, I became constipated. I was afraid to tell my parents because I was afraid I would have to own up to using the laxitives and holding at school. Also they had a humilating prodedure for constipation they called an enema in which you had to lower your panties, lift your skirt and get a tube shoved up your butt and a bagful of warm water injected in you. It was kind of like being raped. I tryed to shit but I couldn't and my abdomin felt bigger and I was feeling more uncomfortable. Finally I decided to give myself an emema. I waited until my parents left for work to do the deed. At first I felt like I couldn't hold it but then I was OK and I waited for about 10 minutes for it to soften my poop and I gave myself sweet relief as it all came out like a rocket. I wiped my ass feeling my better and hurried off to the bus. There was only one hitch. I forgot about "second wave" which of course came while I was on the bus.