I'm planning to "write" on the driveway with my friend's power washer
That sounds crazy! Why would you want to do that with a power washer?
To piss my friend off who owns the power washer, he's too goddamn stingy.
Sometimes I get irritated with my friends too, but it's never right to retaliate and have them use their property without you getting permission to use it. If you really want to use his power washer, how about you try and ask him politely about it, and try to maybe also talk about your issues with him regarding him being stingy.
What do you know, my friend said that I can use it.
You're still messing around with other people's property using his power washer, right? What if you're caught and the power washer is traced back to him and he gets in trouble? I don't think that you should drag him into your dispute.