I have a filthy mind

Arriving at work with my best friend we had to park about 50 meters from the door. I joked and said can't he park any closer, he replied that there was a park spot a while away but he didn't want to reverse in. I retorted that he can't reverse park to save his life.
He replied.
"I'm better at going in backwards, than coming in forwards."


I PISSED MYSELF - Is it just me or does that sound completely dirty?