My hair is really thick and straight almost like a paintbrush. I would like to messy spike it, what

Go to a barber and tell them what you want. They'll to the rest and, if you ask, show you how to style it. Because you're hair is thick, and you want a real spikey look, ask for them to cut your hair with the razor instead of scissors.

My hair is really thick and straight almost like a paintbrush. I would like to messy spike it, what can I do?

First get a hair cut that is longer on top and shorter in the sides , put gel pulling your hair up and using a dryer,

My hair is really thick and straight almost like a paintbrush. I would like to messy spike it, what can I do?

Next time you get it cut, ask them to texturize it that will make it easy for you to fix ,and make it look messy. You will need the right products. A wax type would work best on the thick straight hair.