Very strange squish sound!!!

[Djruel]

Hey everyone. I hope i posted in the correct place... I have a 2012 automatic yaris with power locks and manual windows... cant remember which model specific...

Anyways, there is a squish sound coming from the front driver side of the car.

I'll start the car, put it in gear, and slowly start to roll with the gas on. After the car moves about 5 feet, a semi loud squish sound is made once. the length of the sound is literally as long as if you said the word "squish". Now, it wont happen again the whole time the car has been on. at stop lights or stop signs... nothing... also, after the car starts for the first time, even just letting the car roll in neutral wont replicate the noise. The gas has to be applied. came to a stop light and turned off the car and turned it back on after a few seconds and it happened again after applying the gas. so it happens with a hot or cold engine. The steering wheel doesn't seem to be a factor because I've tried keeping the steering wheel straight while rolling and I've also turned on the car and sat still turning the steering wheel by its self and no sound. the sound happens at almost the exact distance every time the car starts to move with gas applied. I can't start to figure this one out. maybe one of you have had a similar problem?!?