To put on war paint one must perform oral sex on a menstruating woman with a tampon inserted. With all the pieces in place, the man removes the tampon from the womans vagina by grabbing the string of the tampon with his teeth. Once he has the tampon firmly clenched in his jaws, the individual proceeds to shake his/her head back and forth from right to left in order to administer the "war paint." (Braveheart style except for the hue of the paint is red instead of blue...hahaha, paint)
It was that time of the month for Jimmy's woman so he decided to go on the offensive and get his war paint on for the time of battle.