A quaint little euphamism for a heroin injection.
<i>"Yo homie, you wanna double dose?"
"Nah fool, I got train tracks all the way up to ma fo'head already!"</i>
by Elliott - Seven April 13, 2006
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When a girl is going down on two guys at once and they both blow their loads simultaneously in her ears
'what did you say? I just got a hot brain injection. I can't hear shit!' said Lisa
by Buzzsaw Jones March 17, 2005
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