The speech given (usually to a guy) by a girl when he's started a relationship with her "best friend"
"Mate, i'm in deep shit... i spent last night with jane but i really am not intrested in a relationship"

"Yeah so what's wrong"

"Ellie gave me the best friend speech"

"she..."

"yeah..., the...'thing is...she's my best friend, if you fuck her around I will castrate you and stick your balls so far down your throat you'll be shitting cum for a month...' speech"
by sickboy101 May 17, 2010

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