When a man of African-American descent takes 4 aspirin and uses tabasco sauce (or in some instances barbeque sauce) as a lubricant for masturbation. Traditionally, if barbeque sauce is used, the barbeque sauce given in packets at McDonalds restaurants are preffered.
A Black Guy Flamethrower is a very hard task to accomplish, and is often a point of pride for those who achieve it.
"Hey, homie, I just gave myself a black guy flamethrower..."
"Oh yeah, it burned like a mo'fo'..."
"We should tell Bernie! This is so exciting!"