Blood Slam

And injection of drugs which is done using a needle partially filled with blood of somebody else. Most commonly done as sexual fetish by men spreading disease, it gets you high even if there is only infected blood and no drugs in the needle.

"You want to split this meth with me?"

"Yeah but I only have one needle left."
"Oh, that's okay by me! Do you have HIV? After you inject half of it, pull some blood back into the needles so I can blood slam."
"That is so fucking hot! Okay, I'll brand you with my strain."
"And that way we don't have to have anal sex!"

They had anal sex anyway.