The act of giving someone a pubic noogie. Either by a persons genitalia during sex or with your knuckles while rough housing.
When my pants were off she gave me a wicked brush fire and now my pubes burn like crazy.
After we were playing around for awhile it got pretty rough and now I need some aloe vera to put out this brush fire.
To light one's own pubic hair on fire, primarily for the purposes of entertainment.
JD started a brush fire in the middle of the party.