When a fatGerman lights their fart on fire. For it to be a true German Flare the farter must have eatin greasy bratwurst and sauerkraut. They get on their back, pull their legs back to put their ass up in the air. When they fart and light it, residual grease and little stringy pieces of saurkraut must fly out and catch on fire causing the burning flare affect.
I am sure glad I had that German Flare handy while changing my flat tire last night.