While I was driving down the road i hit a curb, not much just a little pop on pop off kind of deal. So when i kept driving my engine was really rumbling, and when i went to turn into the gas station, my car stalled (it's an automatic) once i turned it back on and got into the gas station (they were closed of course xD) white smoke/steam started coming out from under the hood. This yellow-ish liquid was also coming out from under the hood onto the ground. My friend said it looked like the transmission was leaking, but im not sure, just wanted to get some other opinions. I also was wondering what the cause might have been (although i have a pretty good idea).