So two dudes are standing up, right? But then one dude bends over, holding onto the other dude's waist, and starts blowing the dude. So then the dude getting the bj all starts waving his arms like "He-ey, look at us, Richard. Motherfucking Flaming Giraffe! Lol."
Some guy with another guy bending horizontally at the waist blowing him: "He-ey, look, Richard, ohmygawd. Flaming Giraffe! Hello!"
A sexual maneuver conducted by two men in which one stands with hands raised and receives fellatio from the other, who is bent at the hips with his arms wrapped around the standing man's waist. The homosexual nature of the act coupled with a profile view of the physical orientation of the men is therefore referred to as a/the "Flaming Giraffe."
I was watching porn last night and these two dudes pulled off a Flaming Giraffe!